Iron rusts from disuse, stagnant water loses its purity, and in cold weather becomes frozen; even so does inaction sap the vigors of the mind.
He who possesses most must be most afraid of loss.
A good painter has two main objects to paint, man and the intention of his soul. The former is easy, the latter hard as he has to represent it by the attitude and movement of the limbs.
Where the spirit does not work with the hand there is no art.
One can have no smaller or greater mastery than mastery of oneself.
Poor is the pupil who does not surpass his master.
Although nature commences with reason and ends in experience it is necessary for us to do the opposite, that is to commence with experience and from this to proceed to investigate the reason.
As a well-spent day brings happy sleep, so a life well spent brings happy death.
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.
Human subtelty will never devise an invention more beautiful, more simple or more direct than does Nature, because in her inventions, nothing is lacking and nothing is superfluous.
I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.
I have offended God and mankind because my work didn't reach the quality it should have.
Life is pretty simple: You do some stuff. Most fails. Some works. You do more of what works. If it works big, others quickly copy it. Then you do something else. The trick is doing something else.
Marriage is like putting your hand into a bag of snakes in the hope of pulling out an eel.
Simplicity is the ultimate sophistication.
The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.
The poet ranks far below the painter in the representation of visible things, and far below the musician in that of invisible things.
While I thought that I was learning how to live, I have been learning how to die.
Why does the eye see a thing more clearly in dreams than the imagination when awake?
You do ill if you praise, but worse if you censure, what you do not understand.