Animals like crows, owls or black cats are not ominous at all; it is the men's superstitious mind which is the inauspicious one!

To breathe, we do not only need air and lungs, but also freedom!

Happiness is often somewhere near us, not in the far places!

If what we said cannot go beyond the century we live in, it means that we have said nothing. Let us say something for all the centuries!

History of science is a relay race, my painter friend. Copernicus took over his flag from Aristarchus, from Cicero, from Plutarch; and Galileo took that flag over from Copernicus.

The tragedy of man is that the happy moments of life behave like the birds of the forests: They appear and disappear suddenly!

More gates you open, more worlds you discover! More worlds you discover, more gates are opened!