One who never turned his back but marched breast forward, never doubted clouds would break.

The forest doesn't need us, but we need the forest—this truth should guide every decision we make in forestry.

The man who believes that the secrets of the world are forever hidden lives in mystery and fear. Superstition will drag him down. The rain will erode the deeds of his life. But that man who sets himself the task of singling out the thread of order from the tapestry will by the decision alone have taken charge of the world and it is only by such taking charge that he will effect a way to dictate the terms of his own fate.

The great philosophers are those who have made a difference in the way we think about the world and our place in it.

The definition of a good mathematical problem is the mathematics it generates rather than the problem itself.