Every action needs to be prompted by a motive.

Common Sense is that which judges the things given to it by other senses.

Our body is dependent on heaven and heaven on the Spirit.

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

When the thing taken into union is perfectly adapted to that which receives it, the result is delight and pleasure and satisfaction.

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

A single and distinct luminous body causes stronger relief in the objects than a diffused light; as may be seen by comparing one side of a landscape illuminated by the sun, and one overshadowed by clouds, and illuminated only by the diffused light of the atmosphere.