Commento su Ecclesiaste 12:10

Koheles sought. He set his heart and sought the matter and found it.

“Beyond the fact that Kohelet was wise, moreover, he taught the people knowledge, considered and analyzed, composed many proverbs. Kohelet sought to find words of delight, and what was written uprightly, words of truth” (Ecclesiastes 12:9–10).
“Beyond the fact that Kohelet was wise” – at the end of Ecclesiastes it is written: “Kohelet sought to find words of delight [ḥefetz]…”; Kohelet sought to understand the reward given for mitzvot, as it is written: “For in these I delight [ḥafatzti], the utterance of the Lord” (Jeremiah 9:23). The Holy One blessed be He said to him: Solomon, “and what was written uprightly, words of truth,” I have written it in the Book of Uprightness:⁴²The Bible “How great is the goodness that You have stored for those who fear You” (Psalms 31:20). Moreover, it is written: “For you will be a land of delight” (Malachi 3:12).
Moreover, he sought to understand the reward for Torah, as it is stated: “All objects [ḥafatzim] cannot equal it” (Proverbs 8:11). The Holy One blessed be He said to him: Solomon, “and what was written uprightly, words of truth,” I have already written it in the Book of Uprightness. That is what is written: “No eye has seen, God, besides You” (Isaiah 64:3).
Kohelet sought to understand the end of days, when it will be, as it is stated: “That you not awaken, and you not rouse love, until it desires [sheteḥpatz]” (Song of Songs 2:7). The Holy One blessed be He said to him: I have already written it in the Book of Uprightness: “For the day of vengeance is in My heart, [and the year of My redemption has come]” (Isaiah 63:4).
Rabbi Shaul of Naveh teaches it in the name of Rabbi Shimon: If a person will say to you: When is the end of the redemption? You shall say to him: It is written: “For the day of vengeance is in My heart” (Isaiah 63:4). Rabbi Yehuda ben Rabbi Simon [said] in the name of Rabbi Yehoshua ben Levi: I indicated to you three indicators regarding the burial of Moses, “in the canyon, in the land of Moav, opposite Beit Peor” (Deuteronomy 34:6), and nevertheless, “no man knows his burial place” (Deuteronomy 34:6). If the heart does not reveal to the mouth, to whom will the mouth reveal?⁴³The Torah gives three details as to the location of Moses’ burial, and yet it also states that no one knows the exact location. With regard to the redemption, the verse in Isaiah does not give any details as to when it will take place, and states that “the day of vengeance is in My heart,” indicating that God kept it to Himself. Thus, there is certainly no way for anyone to know when it is.

Words of delight. The law [as it was given] to Moshe at Sinai.⁵²The Gemara in Rosh Hashannah 21b expounds this verse, that Koheles sought to be like Moshe. A heavenly voice emerged and said, “and to write in a proper way [=וכתוב ישר] words of truth [דברי אמת];” and in Devarim 34:10 it states, "and no prophet has there arisen in Yisroel like Moshe." Another name for Devarim is ספר הישר which is alluded to [וכתוב ישר] in this verse. (Maharsha)

And to write in a proper way. This refers to the written Torah and the Prophets.