To explain all nature is too difficult a task for any one man or even for any one age. 'Tis much better to do a little with certainty, and leave the rest for others that come after you, than to explain all things by conjecture without making sure of anything.

If I have seen further than others, it is by standing upon the shoulders of giants.

The most beautiful experience we can have is the mysterious. It is the source of all true art and science.

We also honour the great Che Guevara, whose revolutionary exploits, including on our own continent, were too powerful for any prison censors to hide from us. The life of Che is an inspiration to all human beings who cherish freedom. We will always honour his memory.

A nation with a strong base in science and technology is a nation with a strong backbone.

Science is meaningless because it gives no answer to our question, the only question important for us: 'What shall we do and how shall we live?'