Let truth be a banner big enough to hide the man who holds it up.

A tree nowhere offers a straight line or a regular curve, but who doubts that root, trunk, boughs, and leaves embody geometry?

A man's own addition to what he learns is cement to bind an otherwise loose heap of stones into a structure of unity, strength, and use.

Let truth be a banner big enough to hide the man who holds it up.

Form may be of more account than substance. A lens of ice will focus a solar beam to a blaze.

Doubt is the beginning, not the end, of wisdom.

Error held as truth has much the effect of truth. In politics and religion this fact upsets many confident predictions.