Fear arises sooner than anything else.

Be a mirror, absorb everything around you and still remain the same

Many will think they may reasonably blame me by alleging that my proofs are opposed to the authority of certain men held in the highest reverence by their inexperienced judgments; not considering that my works are the issue of pure and simple experience.

It is no small benefit on finding oneself in bed in the dark to go over again in the imagination the main lines of the forms previously studied, or other noteworthy things conceived by ingenious speculation.

We, by our arts may be called the grandsons of God.

How painting surpasses all human works by reason of the subtle possibilities which it contains.

Of the four elements water is the second in weight and the second in respect of mobility. It is never at rest until it unites with the sea.