When I was in my twenties and broke, I’d buy books before food. A meal will sustain you for a few hours, a good book will sustain you for life.

The most powerful and sustaining motivation for success comes from within, not from anticipating rewards that come from the outside.

Of these austerer virtues the love of truth is the chief, and in mathematics, more than elsewhere, the love of truth may find encouragement for waning faith. Every great study is not only an end in itself, but also a means of creating and sustaining a lofty habit of mind; and this purpose should be kept always in view throughout the teaching and learning of mathematics.