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.

Love, Fear, and Esteem, - Write these on three stones.

As every divided kingdom falls, so every mind divided between many studies confounds and saps itself.

Instrumental or mechanical science is the noblest and above all others, the most useful.

Study me, reader, if you delight in me, because on very few occasions shall I return to the world, and because the patience for this profession is found in very few, and only in those who wish to compose things anew. Come, oh men, to see the miracles that such studies will disclose to nature.

Obstacles cannot crush me. Every obstacle yields to stern resolve. He who is fixed to a star does not change his mind.

Motion is created by the destruction of balance.