A wise system of education will at last teach us how little man yet knows, how much he has still to learn.

Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters and teach some of us more than we can ever learn from books.

Our duty is to believe that for which we have sufficient evidence, and to suspend our judgment when we have not.

Rest is not idleness, and to lie sometimes on the grass under trees on a summer's day, listening to the murmur of the water, or watching the clouds float across the sky, is by no means a waste of time.