You can only acquire really useful general ideas by first acquiring particular ideas . . . You cannot make bricks without straw.

Any change, even a change for the better, is always accompanied by drawbacks and discomforts.

Worry is evidence of an ill-controlled brain; it is merely a stupid waste of time in unpleasantness.

The test of a first-rate work, and a test of your sincerity in calling it a first-rate work, is that you finish it.

We shall never have more time. We have, and always had, all the time there is. No object is served in waiting until next week or even until tomorrow. Keep going... Concentrate on something useful.

The gain in self-confidence of having accomplished a tiresome labour is immense.

Your own mind is a sacred enclosure into which nothing harmful can enter except by your permission.