If I am not for myself, who will be for me? But if I care for myself only, what am I?… — Hillel, Pirke Avot 1:14

If I am not for myself, who will be for me? But if I care for myself only, what am I? And if not now, when?

From Joseph I. Gorfinkle, Pirke Avot: The Sayings of the Jewish Fathers (1913, PD)