Pirkei Avot §avot_04_15: Rabbi Yannai said: it is not in our hands [to explain the reason] either of t...

Rabbi Yannai said: it is not in our hands [to explain the reason] either of the security of the wicked, or even of the afflictions of the righteous. Rabbi Mathia ben Harash said: Upon meeting people, be the first to extend greetings; And be a tail unto lions, and not a head unto foxes.