Every week during the summer, it is traditional Jewish practice to study a chapter of a work called “Pirkei Avot.” It’s a collection of inspiring quotes and sayings by some of the most prominent Jewish leaders and sages. The first chapter contains the following universally-known quote by Hillel the Elder:
"If I am not for myself, who will be for me? But if I am only for myself, what am I? And if not now, when?"