We consider it essential to teach a young person a craft from which to earn a livelihood, as our Sages said concerning a father's obligations towards his son: "Where do we find the father's obligation to teach his son a craft? Hizkiyah said that it says in Scripture, 'Enjoy happiness with a woman you love'. If we are to take the text's meaning as actually referring to a woman, one should say as follows: Just as one is obligated to have him wed, so is one obligated to teach him a craft." We see the extent to which our Sages, of blessed memory, valued the teaching of a trade to a young person - to the point that the study of a craft was equivalent in their eyes to Torah study, and equivalent to marrying. Just as the first determines the world – birth perpetuating the human species – thus does craft sustain the existence of the human species.