Rabbi Meir says: A person should always teach his son a clean and easy trade and pray for success to the One to Whom wealth and property belong, as ultimately there is no trade that does not include both poverty and wealth, since a person can become rich from any profession.
Poverty does not come from a particular trade, nor does wealth come from a particular trade, but rather, all is in accordance with a person’s merit. Therefore, one should choose a clean and easy trade, and pray to God for success.
Rabbi Shimon ben Elazar says: Have you ever seen a beast or a bird that has a trade? And yet they earn their livelihood without anguish. But all these were created only to serve me, and I, a human being, was created to serve the One Who formed me. Is it not right that I should earn my livelihood without anguish? But I, i.e., humanity, have committed evil actions and have lost my livelihood. This is why people must work to earn a living.
Abba Guryan of Tzadyan says in the name of Abba Gurya: A person may not teach his son the trades of a donkey driver, a camel driver, a pot maker, a sailor, a shepherd, or a storekeeper. The reason for all these is the same, as their trades are the trades of robbers; all of these professions involve a measure of dishonesty and are likely to lead to robbery.
....Rabbi Nehorai says: I set aside all the trades in the world, and I teach my son only Torah, as a person partakes of its reward in this world and the principal reward remains for him in the World-to-Come, which is not true of other professions, whose rewards are only in this world.
Furthermore, if a person comes to be ill, or old, or undergoes suffering, and is unable to be involved in his trade, behold, he dies in hunger. But with regard to the Torah it is not so, since one can study it under all circumstances.
Rather, it preserves him from all evil and sin in his youth, and provides him with a future and hope in his old age.