Midrash su Ecclesiaste 9:9

A Tale of Rabbi Kahana: Rabbi Kahana and his wife were blessed by God with a (only) son, whom they named Saliq. And when the boy was just five years old, Rabbi Kahana seized him with his hand and wished to take him from their home to the House of Study to learn Torah. The boy's mother spoke up and said to [Rabbi Kahana] "where are you taking my boy?" [Rabbi Kahana] replied "we must entrust him to someone who is able to teach him Torah." She responded to him "it would be far better for both of us to die than for for us to witness our son's departure. He must not leave us, neither to study Torah nor to pursue a trade." Her husband replied "quickly, fetch your marriage contract and I will read it and pay what is stipulated in it per the conditions of a divorce settlement." She said to him "what blemish do you see in me that you wish to divorce me. For is it not written: "If a man marries a woman and it happens that she does not find favor in his eyes for he has found something indecent about her, and he will write for her a certificate of divorce..." (Deuteronomy 24:1). Her husband replied and said "there is no greater blemish than your action, for you preventing my son from drinking the Living Waters (i.e., the words of Torah). And "water" is none but Torah. As it is written "all those who are thirsty, come to the waters" (Isaiah 55:1). And it is written "For they are life to those who find them" (Proverbs 4:22). The wife then said "let us make a compromise between you and I." Says he, "how so?" She replied "go to the marketplace and find us an expert rabbi, and offer an agreement for him to teach our son at home for many days and years, and I will attend to him honorably, and [prepare his meals and launder his clothes]." Immediately, the husband ran to the marketplace and found a wise man sitting and tying his tzitzit (tassels) in seven loops. [Rabbi Kahana] said to the [Wise Man] "peace be upon you, Rabbi." The [Wise Man] replied "peace be upon you, my lord." [Rabbi Kahana] asked "what is your name?" The [Wise Man] replied "my name is Eliezer the Small One." [Rabbi Kahana] then asked "do you have a wife and children?" The [Wise Man] replied "indeed, and they are here with me. My wife is the Torah." As it is written "enjoy happiness with a woman you love all the fleeting days of life that have been granted to you under the sun—all your fleeting days. For that alone is what you can get out of life and out of the means you acquire under the sun" (Ecclesiastes 9:9). The Wise Man continued "And the children of my master are my students, they are now men of Torah." And indeed, each person is obligated to teach their child Torah once they reach the age of six or seven. As it is written "This people I formed for Myself so that they will declare My praise." (Isaiah 43:21). [The Hebrew word "this" (זו) contains the numbers six (ו) and seven (ז)]. Immediately, the woman said to the Wise Man "you will teach my son at our home and my son Saliq will not leave the entrance of my home." The Wise Man replied "I accept your proposal." Immediately, Rabbi Kahana wrote an employer's contract for Rabbi Eliezer. And similarly, Rabbi Eliezer wrote an employee's contract for Rabbi Kahana and taught [Rabbi Kahana's] son Saliq. And so it happened that from the day of his birth from his mother's womb, Saliq never once crossed the doorway of his home. Instead, he remained and studied for twenty-five years, until he reached the age of thirty. And Rabbi Kahana paid Rabbi Eliezer the Small one thousand measurements of gold.

"And one is in duty bound to teach his son an occupation." Whence do we infer this? Said R. Ezekiah: "The passage says (Ecc, 9, 9) Enjoy life with the wife whom thou lovest; i.e., if it refers to a real wife, then we assume that just as well as one is to marry off his son, so also it is his duty to teach him a trade. And if it refers to the Torah, we can say just as one is in duty bound to teach his son so is he in duty bound to teach him an occupation. According to some authorities, he is even in duty bound to teach his son how to swim, because it sometimes may prove the saving of his son's life, [should he happen to be in a stranded ship]. R. Juda says: "Anyone who does not teach his child an occupation is just as if he were instructing him in burglary." What is the difference between these two opinions? The difference is in giving him a commercial training. [According to the former opinion it is sufficient because he teaches his son to earn his livelihood; but as to the latter opinion, he must teach him an occupation only, and commerce may lead to burglary].

“For love is as intense as death” – the love that the Holy One blessed be He has for you is as intense as death. That is what is written: “I have loved you, said the Lord…” (Malachi 1:2). “Jealousy is as cruel as the grave” – when they infuriate the Holy One blessed be He with their idol worship, as it is stated: “They would infuriate Him with strange gods” (Deuteronomy 32:16).
Another matter: “For love is as intense as death” – the love that Isaac had for Esau; that is what is written: “Isaac loved Esau” (Genesis 25:28). “Jealousy is as cruel as the grave” – the jealousy Esau had for Jacob, as it is stated: “Esau hated Jacob [because of the blessing with which his father blessed him]” (Genesis 27:41).
Another matter: “For love is as intense as death” – the love that Jacob had for Joseph, as it is stated: “Israel loved Joseph more than his sons” (Genesis 37:3). “Jealousy is as cruel as the grave” – the jealousy that his brothers had for him, as it is stated: “His brothers were jealous of him” (Genesis 37:11).
Another matter: “For love is as intense as death” – the love that Jonathan had for David, as it is stated: “Jonathan loved him as himself” (I Samuel 18:1). “Jealousy is as cruel as the grave” – the jealousy that Saul had for David, as it is stated: “Saul eyed David with suspicion” (I Samuel 18:9).
Another matter: “For love is as intense as death” – the love that a man has for his wife, as it is stated: “Enjoy life with a woman whom you love” (Ecclesiastes 9:9). “Jealousy is as cruel as the grave” – the jealousy that he has regarding her when he says to her: Do not speak with so-and-so, and she goes and speaks with him, and immediately, “a spirit of jealousy passes over him and he is jealous of his wife” (Numbers 5:14).
Another matter: “For love is as intense as death” – the love that the generation of persecution had for the Holy One blessed be He, as it is stated: “For we are killed all day long for You” (Psalms 44:23). “Jealousy is as cruel as the grave” – as the Holy One blessed be He is destined to have great zealotry on behalf of Zion. That is what is written: “So said the Lord [of hosts]: I became zealous for Zion with great zealotry” (Zechariah 8:2). “Its sparks are the sparks of fire, a great conflagration” – Rabbi Berekhya said: Like the supernal fire; the fire does not quench water and the water does not extinguish fire.