What is meant here by saying that existence precedes essence? It means first of all, man exists, turns up, appears on the scene, and, only afterwards, defines himself. If man, as the existentialist conceives him, is indefinable, it is because at first he is nothing. Only afterward will he be something, and he himself will have made what he will be.
In order to judge of the inside of others, study your own; for men in general are very much alike; and though one has one prevailing passion, and another has another, yet their operations are much the same; and whatever engages or disgusts, pleases or offends you, in others, will, mutatis mutandis, engage, disgust, please, or offend others, in you.