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.

I say that the power of vision extends through the visual rays to the surface of non-transparent bodies, while the power possessed by these bodies extends to the power of vision.

He who is fixed to a star does not change his mind.

Poor is the pupil who does not surpass his master.

Wood feeds the fire which burns it.

We may call painting the grandchild of nature.

Experience is a truer guide than the words of others.