You [Mankind] have been given no particular function. You may give your life whatever form you choose, do whatever you wish … you have no limitations, and can act in accord with your own free will. You alone can choose the limits of your nature. ↗
A new scientific truth does not triumph by convincing opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it. ↗
Sex and excretion are reminders that anyone's claim to round-the-clock dignity is tenuous. The so-called rational animal has a desperate drive to pair up and moan and writhe. ↗
What people regard as vanity—leaving great works, having children, acting in such a way as to prevent one's name from being forgotten—I regard as the highest expression of human dignity. ↗