The distinguishing sign of slavery is to have a price, and to be bought for it.

Architecture ... the adaptation of form to resist force.

Know thyself, for through thyself only thou canst know God.

In health of mind and body, men should see with their own eyes, hear and speak without trumpets, walk on their feet, not on wheels, and work and war with their arms, not with engine-beams, nor rifles warranted to kill twenty men at a shot before you can see them.

If you do not wish for His kingdom do not pray for it. But if you do you must do more than pray for it, you must work for it.

It is a strange thing how little in general people know about the sky. It is the part of creation in which nature has done more for the sake of pleasing man.

He who has learned what is commonly considered the whole art of painting, that is, the art of representing any natural object faithfully, has as yet only learned the language by which his thoughts are to be expressed.