It's always too early to quit.

Fill the unforgiving minute with sixty seconds worth of distance run.

A pint of sweat, saves a gallon of blood.

If a man is called to be a streetsweeper, he should sweep streets even a s Michelangelo painted, or Beethoven composed music, or Shakespeare wrote poetry. He should sweep streets so well that all the hosts of heaven and earth will pause to say, here lived a great streetsweeper who did his job well.

If a man does his best, what else is there?

The difference between a successful person and others is not a lack of strength, not a lack of knowledge, but rather a lack of will.