Musar su Deuteronomio 16:17

איש כמתנת ידו כברכת ה' אלוקיך אשר נתן לך . The two letters כ in front of the words כמתנת, כברכת, are a reminder that when we give a gift we should never feel that what we are giving away was ours in the first place, and that we therefore are truly generous. Whatever is at our disposal was given to us by G–d. David expressed this idea already very forcefully when he said (Chronicles I 29,14): כי ממך הכל ומידך נתנו לך, “For everything is from You, and it is Your gift that we have given to You.” The Torah alludes to this by not writing מתנת ידך, but כמתנת ידך instead.

Now we, who always bring to remembrance the merit of the fathers [on our behalf] must walk, likewise, in the footsteps of Jacob our father, may peace be upon him. And every father must see to it to habituate his son to Torah and to mitzvoth so long as he is at his table; that is, until he is twenty-one years of age. And then, even if his lot falls to serve his majesty, the emperor, and he certainly will not be able to study Torah at that time, still, there will not depart from him the holiness of the Torah that he had learned until then. [And certainly the Holy One Blessed be He will prosper him and will incline the hearts of the king and his counselors and his princes to him for the good, as it is written in regard to Joseph (Bereshith 39:21): "And the L-rd was with Joseph, and He conferred grace upon him, and He granted him favor, etc."] And also, at the end of his term of service, when he returns home, all of his deeds will be done with integrity and his father will not be ashamed of him, and the Holy One Blessed be He will prosper him for this in this world, as he did with Jacob our father at the end of his term of service with Lavan, as written in the Torah. And also, in the celestial world, when he merits standing before the throne of honor of the Blessed One, he will be one of the "holy ones" of the L-rd in the merit of having singled out the L-rd to be his G-d, as it is written (Devarim 16:17-19): "The L-rd did you single out this day to be to you as a G-d, and to walk in His ways, and to keep His statutes, and His mitzvoth… And the L-rd did single you out this day… and to be a holy people to the L-rd your G-d, etc."