Only one-fourth of the sorrow in each man's life is caused by outside uncontrollable elements, the rest is self-imposed by failing to analyze and act with calmness.
Love is the most subtle form of self-interest.
The great revolution of the future will be Nature's revolt against man.
We are more inclined to regret our virtues than our vices; but only the very honest will admit this.
Be contented, when you have got all you want.
Great books conserve time.