The great body of physical science, a great deal of the essential fact of financial science, and endless social and political problems are only accessible and only thinkable to those who have had a sound training in mathematical analysis, and the time may not be very remote when it will be understood that for complete initiation as an efficient citizen of one of the new great complex worldwide States that are now developing, it is as necessary to be able to compute, to think in averages and maxima and minima, as it is now to be able to read and write.

I went over the heads of the things a man reckons desirable. No doubt invisibility made it possible to get them, but it made it impossible to enjoy them when they are got.

Success is to be measured not by wealth, power, or fame, but by the ratio between what a man is and what he might be.

Room to swing a cat, it seemed was absolutely essential. It was an infrequent but indispensable operation.

Sometimes, you have to step outside of the person you've been and remember the person you were meant to be. The person you want to be. The person you are.

Money means in a thousand minds a thousand subtly different, roughly similar, systems of images, associations, suggestions and impulses.

There is no upper limit to what individuals are capable of doing with their minds. There is no age limit that bars them from beginning. There is no obstacle that cannot be overcome if they persist and believe.