It is the mark of an educated mind to be able to entertain a thought without accepting it.

Action to be effective must be directed to clearly conceived ends.

Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either.

Before I went to jail, I was active in politics as a member of South Africa's leading organizations - and I was generally busy from 7 A.M. until midnight. I never had time to sit and think.

We don't want tradition. We want to live in the present and the only history that is worth a tinker's dam is the history we make today. 

Complacence among the masses may lead to subjugation bythe leaders.

Pure mathematics is, in its way, the poetry of logical ideas.

Men are mortal. So are ideas. An idea needs propagation as much as a plant needs watering. Otherwise both will wither and die.

Nature gives to every time and season some beauties of its own; and from morning to night, as from the cradle to the grave, it is but a succession of changes so gentle and easy that we can scarcely mark their progress.

Even if we lose the wealth of thousands, and your life is sacrifice, we should keep smiling and be cheerful keeping your faith in God and Truth.

Most people have no concept of how an automatic transmission works, yet they know how to drive a car. You don't have to study physics to understand the laws of motion to drive a car. You don't have to understand any of this stuff to use Macintosh.

The law is reason, free from passion.