The more you know, the more you know you don't know.

Try is a noisy way of doing nothing.

For the real difference between humans and other animals is that humans alone have perception of good and evil, just and unjust, etc. It is the sharing of a common view in these matters that makes a household and a state.

...perhaps there is some element of good even in the simple act of living, so long as the evils of existence do not preponderate too heavily.

There is no such thing as committing adultery with the right woman, at the right time, and in the right way, for it is simply WRONG.

Happiness is the meaning and the purpose of life, the whole aim and end of human existence.

Those who assert that the mathematical sciences say nothing of the beautiful or the good are in error. For these sciences say and prove a great deal about them; if they do not expressly mention them, but prove attributes which are their results or definitions, it is not true that they tell us nothing about them. The chief forms of beauty are order and symmetry and definiteness, which the mathematical sciences demonstrate in a special degree.