He who wishes to be rich in a day will be hanged in a year.

The supreme misfortune is when theory outstrips performance

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.

For those colours which you wish to be beautiful, always first prepare a pure white ground.

It is an acknowledged fact that we perceive errors in the work of others more readily than in our own.

Nature is constrained by the cause of her laws which dwell inborn in her. Variant: Nature is constrained by the order of her own law which lives and works within her.

Every action done by nature is done in the shortest way.