Today's rebel is tomorrow's tyrant.

It is good a philosopher should remind himself, now and then, that he is a particle pontificating on infinity.

When his apprenticeship was finished (the candidate for Knighthood) was received into the Knightly Order by a ritual of sacramental awe.

Man, not the earth, makes civilization.

The laws of biology are the fundamental lessons of history.

The conservative who resists change is as valuable as the radical who proposes it.

The influence of geographic factors diminishes as technology grows. The character and contour of a terrain may offer opportunities for agriculture, mining, or trade, but only the imagination and initiative of leaders, and the hardy industry of followers, can transform the possibilities into fact...Man, not the earth, makes civilization.