人类
I can calculate the motions of the heavenly bodies， but not the madness of people.
I believe that every human has a finite number of heartbeats. I don't intend to waste any of mine running around doing exercises.
That's one small step for (a) man, one giant leap for mankind.
Prophesying was the only human art that couldn't be improved by practice.
He is the only animal that loves his neighbor as himself, and cut his throat if his theology isn't straight.
Anxiety is essential to the human condition. The confrontation with anxiety can relieve us from boredom, sharpen the sensitivity and assure the presence of tension that is necessary to preserve human existence.