Obstacles cannot bend me. Every obstacle yields to effort.

He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.

Many have made a trade of delusions and false miracles, deceiving the stupid multitudes.

The boundaries of bodies are the least of all things.

There are many kinds of beauty as people who possess it.

One painter ought never to imitate the manner of any other; because in that case he cannot be called the child of nature, but the grandchild. It is always best to have recourse to nature, which is replete with such abundance of objects, than to the productions of other masters, who learnt everything from her.

Medicine is the restoration of discordant elements.