I rarely think in words at all.

Beyond the realms of what we see, into the regions or the unexplored limited only by our imaginations.

Great spirits have always found violent opposition from mediocre minds. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence.

I never teach my pupils, I only attempt to provide the conditions in which they can learn.

Peace cannot be kept by force; it can only be achieved by understanding.

In scientific thinking are always present elements of poetry. Science and music requires a thought homogeneous.

Only a monomaniac gets anything done.