All our knowledge has its origins in our perceptions.

When you put your hand in a flowing stream, you touch the last that has gone before and the first of what is still to come.

The eye transmits its own image through the air to all the objects which face it, and also receives them on its own surface, whence the "sensus communis" takes them and considers them.

Whoever does not respect life, does not deserve it.

In life beauty perishes, but not in art.

Whoever in debate quotes authority uses not intellect, but memory.

Experience does not err. Only your judgments err by expecting from her what is not in her power.