God is like the sun; you cannot look at it, but without it you cannot look at anything else.

This is the perpetual and pitiful tragedy of the practical man in practical affairs. He always begins with a flourish of contempt for what he calls theorizing and what people who can do it call thinking. He will not wait for logic-that is, in the most exact sense, he will not listen to reason. It will therefore appear to him an idle and ineffectual proceeding to say that there is a reason for his present failure. Nevertheless, it may be well to say it, and to try and make it clear even to him.

Education is simply the soul of a society as it passes from one generation to another.

The telescope makes the world smaller; it is only the microscope that makes it larger.

Then I only wondered who put the toys in the stocking; now I wonder who put the stocking by the bed, and the bed in the room, and the room in the house, and the house on the planet, and the great planet in the void.

It is one thing to describe an interview with a gorgon or a griffin, a creature who does not exist. It is another thing to discover that the rhinoceros does exist and then take pleasure in the fact that he looks as if he didn't.

No man can be merry unless he is serious.