Aristotle

The investigation of the truth is in one way hard, in another easy. An indication of this is found in the fact that no one is able to attain the truth adequately, while on the other hand we do not collectively fail, but every one says something true about the nature of things, and while individually we contribute little or nothing to the truth, by the union of all a considerable amount is amassed.

For imagining lies within our power whenever we wish . . . but in forming opinons we are not free . . .

Wonder implies the desire to learn.

What is common to many is taken least care of, for all men have greater regard for what is their own than for what they possess in common with others.

The greatest virtues are those which are most useful to other persons.

It was through the feeling of wonder that men now and at first began to philosophize.

It is better to rise from life as from a banquet -- neither thirsty nor drunken.