Error itself may be happy chance.

Every organism requires an environment of friends, partly to shield it from violent changes, and partly to supply it with its wants.

War can protect; it cannot create.

Great people plant trees they'll never sit under.

The aim of science is to seek the simplest explanation of complex facts. We are apt to fall into the error of thinking that the facts are simple because simplicity is the goal of our quest. The guiding motto in the life of every natural philosopher should be ``Seek simplicity and distrust it.''

There is a technique, a knack, for thinking, just as there is for doing other things. You are not wholly at the mercy of your thoughts, any more than they are you. They are a machine you can learn to operate.

After you understand about the sun and the stars and the rotation of the earth, you may still miss the radiance of the sunset.