"The tears of the world are a constant quantity. For every one who begins to weep, somewhere else another stops. The same is true of the laughter."

"The ultimate test for us of what a truth means is the conduct it dictates or inspires."

"The greatest use of a life is to spend it for something that will outlast it."

"The intellectual life of man consists almost wholly in his substituting a conceptual order for the perceptual order in which his experience originally comes."

"The difference between a bad habit and a good one is that a bad habit is easy to acquire and difficult to get rid of, while a good habit is difficult to acquire and easy to get rid of."