The only thing that isn’t worthless: to live this life out truthfully and rightly. And be patient with those who don’t. - Marcus Aurelius

...be tolerant with others and strict with yourself. Remember, nothing belongs to you but your flesh and blood—and nothing else is under your control. (Hays translation)

As surgeons keep their instruments and knives always at hand for cases requiring immediate treatment, so shouldst thou have thy thoughts ready to understand things divine and human, remembering in thy every act, even the smallest, how close is the bond that unites the two.

Let no act be done at haphazard, nor otherwise than according to the finished rules that govern its kind.