You will never have a greater or lesser dominion than that over yourself.
Avoid the precepts of those thinkers whose reasoning is not confirmed by experience.
If you find from your own experience that something is a fact and it contradicts what some authority has written down, then you must abandon the authority and base your reasoning on your own findings.
Even the richest soil, if left uncultivated will produce the rankest weeds.
Music... is the shaping of the invisible.
Perspective is a most subtle discovery in mathematical studies, for by means of lines it causes to appear distant that which is near, and large that which is small.