A great physicist is always a metaphysicist as well he has a higher concept of his knowledge and his task.

We do not escape our boundaries or our innermost being. We do not change. It is true we may be transformed, but we always walk within our boundaries, within the marked-off circle.

Unfortunately robots capable of manufacturing robots do not exist. That would be the philosopher's stone, the squaring of the circle.

The cautious faith that never saws off a limb on which it is sitting, never learns that unattached limbs may find strange unaccountable ways of not falling.

If you show someone something you've written, you give them a sharpened stake, lie down in your coffin, and say, ‘When you’re ready’.

The words you can't find, you borrow.

Perhaps this was one of the tragedies life plots for us: it is our destiny to become in old age what in youth we would have most despised.

This document [the Reconstruction and Development Programme] was translated into a simpler manifesto called 'A Better Life for All', which in turn became the ANC's campaign slogan.

Next time I will ...""From now on I will ..."- What makes me think I am wiser today than I will be tomorrow?

The welfare of our children is our main concern, and their best interests are our first priority.

We are going to sign a treaty with Mexico. We are competing internationally. We need another international airport for international cargo, international travel, international businesses.

There's not a lot of good movies being made.

I grew up in a time when it would never have occurred to anyone to tell me there was anything I couldn't do.