Modern man uses ideas and persuasion to achieve his goals; primitive man uses guns and brute force to achieve his goals! Moral and clever people choose the first method; immoral and stupid people choose the second method!

All the sands of the world even when they unite together cannot create the hardness of a single rock!

When everything around you is crazy, it is ingenious to stay calm.

If you are after truth, leave your cave!

When you come across with the ideas that you don't like and even hate, do these three things: Be tolerant, be tolerant and be tolerant! Let them speak! Let the stupid and even the fools speak! Protecting freedom of expression under every circumstance is an honour for a man!

However infinite the Universe may be, our true and practical universe is still the surroundings of the house we live in.

There must be every kind of books in your library. The most beautiful gardens are those with many different flowers, with all kinds of herbs and weeds!