No law or ordinance is mightier than understanding.

He is unworthy of the name of man who is ignorant of the fact that the diagonal of a square is incommensurable with its side.

For as there are misanthropists, or haters of men, there are also misologists, or haters of ideas, and both spring from the same cause, which is ignorance of the world.

Let every man remind their descendants that they also are soldiers who must not desert the ranks of their ancestors, or from cowardice fall behind.

As a breath of wind or some echo rebounds from smooth, hard surfaces and returns to the source from which it issued, so the stream of beauty passes back into its possessor through his eyes, which is its natural route to the soul; arriving there and setting him all aflutter, it waters the passages of the feathers and causes the wings to grow, and fills the soul of the loved one in his turn with love.

All thought begins with the recognition that something is out of place.

The cure of many diseases is unknown to physicians because they are ignorant of the whole... For the part can never be well unless the whole is well.