When you play, play hard; when you work, don't play at all.

When you are asked if you can do a job, tell 'em, 'Certainly I can!' Then get busy and find out how to do it.

With self-discipline most anything is possible.

When they call the roll in the Senate, the Senators do not know whether to answer 'Present' or 'Not guilty.'

There is absolutely no substitute for hard work.

Useful undertakings which require sustained attention and vigorous precision in order to succeed often end up by being abandoned, for, in America, as elsewhere…

Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus.