who said if not you who if not now when
Hillel the Elder He is popularly known as the author of two sayings: (1) "If I am not for myself who is for me? And being for my own self, what am 'I'? And if not now, when?"[4] and (2) the expression of the ethic of reciprocity, or "Golden Rule": "That which is hateful to you, do not do to your fellow. That is the whole Torah; the rest is the explanation; go and learn."[5]