Midrash su Salmi 21:3

R. Joshua b. Levi said: "One who walks on a road and has no companion, shall study the Torah; for it is said (Pr. 1, 9.) For a wreath of grace are they; if a man have a headache, let him study the Torah, for it is said (Ib. ib. ib.) Are they unto thy head; if a man have a sore throat, let him study the Torah, for it is said (Ib. ib. ib.) And necklaces for thy neck; if a man have stomach sickness, he shall study the Torah, for it is said (Ib. 3, 8.) It will he healthy to thy body, if a man is sick with rheumatism, he shall study the Torah, for it is said (Ib. ib. ib.) And marrow to thy bones; if a man is sick in all or any part of his body, he shall study the Torah, for it is said (Ib. 4, 23.) And to the whole body a healing." R. Juda, the son of R. Chiya, said: "Come and see how the nature of the Holy One, praised be He! differs from that of mortal man. The nature of mortal man is that if a man prescribes a remedy, it may benefit one and injure another; but the Holy One, praised be He! gave the Torah to all Israel, as a remedy for all, and for the whole body, as it is said (Ib. ib. ib.) And to the whole body a healing." R. Ami said: "What is meant by the passage (Ib. 22, 18.) For it is a pleasant thing if thou keep them within thy bosom, if they be altogether firmly seated upon thy lips, i.e., when are the words of the Torah a pleasant thing? If thou keepeth them within thy bosom. And when canst thou keep them in thy bosom? If they are firmly seated upon thy lips." R. Zeira said: "We know from the following: (Ib. 15, 23.) A man hath joy by the answer of his mouth; and how good is a word spoken at the proper time! i.e., when has a man joy? If his mouth is able to answer [a question]." R. Isaac said: "We deduce the above from the following (Deu. 30, 14.) But the word is very nigh unto thee, in thy mouth, and in thy heart, that thou mayest do it, i.e., when is the word nigh unto thee? If it is in thy mouth and in thy heart to do it." Raba said: "We deduce the above from the following (Ps. 21, 3.) The longing of his heart hast Thou given him and the request of his lips hast thou not withheld, Selah, i.e., when hast Thou given him the request of his heart? If the request was not withheld by his lips, Selah." Raba raised the following contradictory question: "It is written (Ib. ib. ib.) The longing of his heart hast Thou given him; [even without praying]; and immediately following, And the request of his lips hast Thou not withheld, Selah. And he answered thus: If the man has merited it, the longing of his heart is given him without requesting it; but if he has not merited it, he must first request it before it is granted to him." In the school of R. Eliezer b. Jacob it was taught: "Wherever we find Netzach, Selah, Va'ed, forming the conclusion of a passage, it signifies that it will be forever, without interruption." As for Netzach, it is written (Is. 57, 16.) For not to eternity will I contend, neither will I be wroth (Lanetzath) forever. As for Selah, it is written (Ps. 48, 9.) As we have heard, so have we seen, in the city of the Lord of Hosts, in the city of our God; God will establish it forever, Selah; as for Va'ed, it is written (Ex. 15, 18.) The Lord will reign forever, and ever (Va'ed) . R. Elazar said: "What is the meaning of the passage (Pr. 1, 9.) And necklace around thy neck, i.e., just as a necklace is loose around the neck and is not seen, all the time [as when the wearer is bending down, so is it with a man. If he is not constantly seen in the streets or markets, but sits at home and studies] he will retain his learning; but if otherwise, he will not retain his learning."

“I have spoken with my heart, saying: Behold, I have amassed and added wisdom, beyond all who were before me over Jerusalem; my heart has seen much wisdom and knowledge” (Ecclesiastes 1:16).
“I have spoken with my heart” – the hearts sees, as it is stated: “My heart has seen much.” The heart hears, as it is stated; “Give your servant an understanding [shome’a]¹²⁰Literally, hearing. heart” (I Kings 3:9). The heart speaks, as it is stated: “I have spoken with my heart.” The heart goes, as it is stated: “Didn’t my heart go?” (II Kings 5:26). The heart falls, as it is stated: “Let no man’s heart fall” (I Samuel 17:32). The heart stands, as it is stated: “Will your heart endure [haya’amod]”¹²¹Literally, stand. (Ezekiel 22:14). The heart rejoices, as it is stated: “Therefore, my heart rejoices” (Psalms 16:9). The heart cries out, as it is stated: Their heart cried out to the Lord” (Lamentations 2:18). The heart is consoled, as it is stated: “Speak to the heart of Jerusalem” (Isaiah 40:2).¹²²This verse is preceded by: “Console, console My people, says your God.” The heart grieves, as it is stated: “Your heart shall not be grieved” (Deuteronomy 15:10). The heart hardens, as it is stated: “The Lord hardened Pharaoh’s heart” (Exodus 9:12). The heart softens [mitrakekh], as it is stated: “Let your heart not be faint” (Deuteronomy 20:3). The heart is saddened, as it is stated: “He was saddened in His heart” (Genesis 6:6). The heart fears, as it is stated: “From the fear of your heart” (Deuteronomy 28:67). The heart breaks, as it is stated: “A broken and contrite heart” (Psalms 51:19). The heart becomes conceited, as it is stated: “Your heart will grow haughty” (Deuteronomy 8:14). The heart is recalcitrant, as it is stated: “But this people had a revolting and rebellious heart” (Jeremiah 5:23). The heart fabricates, as it is stated: “The month that he fabricated from his heart” (I Kings 12:33). The heart contemplates,¹²³Matters of stupidity as it is stated: “[I will have peace] though I walk in the stubbornness of my heart” (Deuteronomy 29:18). The heart overflows, as it is stated: “My heart overflows with goodly matter” (Psalms 45:2). The heart calculates [meḥashev], as it is stated: “Many are the thoughts [maḥshavot] in the heart of man” (Proverbs 19:21). The heart desires, as it is stated: “The desire of his heart You have granted him” (Psalms 21:3). The heart deviates, as it is stated: “Let your heart not turn aside to her ways” (Proverbs 7:25). The heart strays, as it is stated: “You shall not follow after your heart…[after which you stray]” (Numbers 15:39). The heart is sustained, as it is stated: “And sustain your heart” (Genesis 18:5). The heart is stolen, as it is stated: “Jacob stole the heart of Laban” (Genesis 31:20). The heart is humbled, as it is stated: “Perhaps then their hearts will be humbled” (Leviticus 26:41). The heart is enticed, as it is stated: “He spoke soothingly¹²⁴Literally, “to the heart.” Shekhem was speaking to Dina and attempting to entice her to marry him. to the young woman” (Genesis 34:3). The heart goes astray, as it is stated: “My heart has gone astray” (Isaiah 21:4). The heart trembles, as it is stated: “For his heart was trembling” (I Samuel 4:13). The heart awakens, as it is stated: “I am asleep but my heart is awake” (Song of Songs 5:2). The heart loves, as it is stated: “You shall love the Lord your God with all your heart” (Deuteronomy 6:5). The heart hates, as it is stated: “Do not hate your brother in your heart” (Leviticus 19:17). The heart envies, as it is stated: “Let your heart not envy…” (Proverbs 23:17). The heart is searched, as it is stated: “I the Lord search the heart…” (Jeremiah 17:10). The heart is rent, as it is stated: “Rend your heart and not your garments” (Joel 2:13). The heart meditates, as it is stated: “The meditation of my heart will be understanding” (Psalms 49:4). The heart is like fire, as it is stated: “My heart will be like fire” (Jeremiah 20:9). The heart is like stone, as it is stated: “I will remove the heart of stone” (Ezekiel 36:26). The heart repents, as it is stated: “Who returned to the Lord with all his heart” (II Kings 23:25). The heart is incensed, as it is stated: “For his heart is incensed” (Deuteronomy 19:6). The heart dies, as it is stated: “His heart died within him” (I Samuel 25:37). The heart melts, as it is stated “The heart of the people melted” (Joshua 7:5). The heart absorbs matters, as it is stated: “These matters that I command you today shall be upon your heart” (Deuteronomy 6:6). The heart absorbs fear, as it is stated: “I will place My fear in their hearts” (Jeremiah 32:40). The heart thanks, as it is stated: “I will thank my Lord with all my heart” (Psalms 111:1). The heart covets, as it is stated: “Do not covet her beauty in your heart” (Proverbs 6:25). The heart is toughened, as it is stated: “And one who toughens his heart” (Proverbs 28:14). The heart becomes merry, as it is stated: “It was when their hearts were merry” (Judges 16:25). The heart deceives, as it is stated: “Deceit is in the heart of those who devise evil” (Proverbs 12:20). The heart speaks from within, as it is stated: “Hannah was speaking in her heart” (I Samuel 1:13). The heart loves a bribe, as it is stated: “Your eyes and your heart [are only on your ill-gotten gain]” (Jeremiah 22:17). The heart writes matters, as it is stated: “Write them on the tablet of your heart” (Proverbs 3:3). The heart devises, as it is stated: “Duplicity is in his heart, he devises evil” (Proverbs 6:14). The heart absorbs mitzvot, as it is stated: “The wise of heart will grasp mitzvot (Proverbs 10:8). The heart acts with malice, as it is stated: “The malice of your heart deceived you” (Obadiah 1:3). The heart arranges, as it is stated: “To a person are the arrangements of the heart” (Proverbs 16:1). The heart glorifies, as it is stated: “Your heart has glorified you” (II Chronicles 25:19). That is, “I have spoken with my heart, saying: Behold, I have amassed…”