While there is a chance of the world getting through its troubles, I hold that a reasonable man has to behave as though he were sure of it. If at the end your cheerfulness in not justified, at any rate you will have been cheerful.

The past is but the past of a beginning.

Strength is the outcome of need; security sets a premium on feebleness. The work of ameliorating the conditions of life -- the true civilizing process that makes life more and more secure -- had gone steadily on to a climax... And the harvest was what I saw.

Is it any wonder that to this day this Galilean is too much for our small hearts?

In the scientific world I find just that disinterested devotion to great ends that I hope will spread at last through the entire range of human activity.

What on earth would a man do with himself, if something did not stand in his way?

Nothing endures, nothing is precise and certain (except the mind of a pedant), perfection is the mere repudiation of that ineluctable marginal inexactitude which is the mysterious inmost quality of Being