Life is a compromise of what your ego wants to do, what experience tells you to do, and what your nerves let you do.

The greatest please in life is doing what people say you cannot do.

The great pleasure in life is doing what people say you cannot do.

It is good to be without vices, but it is not good to be without temptations.

Nine tenths of modern science is in this respect the same: it is the produce of men whom their contemporaries thought dreamers - who were laughed at for caring for what did not concern them - who, as the proverb went, 'walked into a well from looking at the stars' - who were believed to be useless, if anyone could be such.