A day of worry is more exhausting than a week of work.
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.
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.
Happiness is a thing to be practiced, like the violin.
A wise system of education will at last teach us how little man yet knows, how much he has still to learn.
When we have done our best, we should wait the result in peace.