Test knowledge through experience, be prepared to make mistakes, and be persistent about it.

Let proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.

All objects transmit their image to the eye in pyramids and the nearer to the eye these pyramids are intersected the smaller will the image appear of the objects which cause them.

That which can be lost cannot be deemed riches.

The artist sees what others only catch a glimpse of.

If you put on more garments, the cold cannot reach you. Similarly, increase your patience and concentration and even great injuries cannot vex your mind.

Not to appreciate life, all of life, is not to deserve it.