Talmud su Proverbi 5:15

Rabbi Yishmael son of Rabbi Yosei says: (Study Torah in your old age.) If you studied Torah in your youth, do not say: I don’t have to study in my old age. Rather, study Torah, for you do not know which [period of study] will be most beneficial. If you studied Torah at a time of wealth, do not turn away from it at time of poverty. If you studied Torah at a time of satiation, do not turn away from it at a time of hunger. If you studied Torah at a time of leisure, do not turn away from it at a time of stress. For it is better for a person to have one thing during a crisis than a hundred in the midst of abundance (as it says, “For you do not know if they will both be equally good”), as it says, (Ecclesiastes 11:6), “Sow your seed in the morning, and do not hold back your hand in the evening.”
Rabbi Akiva says: If you studied Torah in your youth (study Torah in your old age), do not say: I don’t have to study in my old age; for you do not know which will be the most beneficial, if both will stay with you, or if both will be equally good, as it says, “Sow your seed in the morning.”
Rabbi Meir says: If you studied with one teacher, do not say: That’s enough for me. Rather, go to another sage and study Torah. But do not go to just anyone. Rather, go to someone who has been close to you from the start, as it says (Proverbs 5:15), “Drink water from your own cistern, that which flows from your own well.”
Every person has an obligation to apprentice with three Torah scholars, such as Rabbi Eliezer, Rabbi Yehoshua, and Rabbi Akiva, as it says (Proverbs 8:34), “Happy is the person who hears me come early to my doors every day, and waits outside my opening.” Do not read it as “doors,” but “a door and two doors” [a total of three], for you do not know if two of them will work for you, or if two of them will be equally good, as it says (Ecclesiastes 11:6), “Sow your seed in the morning.”
Rabbi Yehoshua says: Marry a woman in your youth, and marry a woman in your old age. Have children in your youth, and have children in your old age. Do not say: I will not marry a woman. Rather, marry a woman and have sons and daughters, and be fruitful and multiply greatly in the world. For you do not know if both of them will work out for you, or if both of them will be equally good, as it says (Ecclesiastes 11:6), “Sow your seed in the morning.”