It is a precarious undertaking to say anything reliable about aims and intentions.

I have no particular talent. I am merely inquisitive.

The true definition of madness is repeating the same action, over and over, hoping for a different result.

Good acts are like good poems. One may easily get their drift, but they are not rationally understood.

Human knowledge and skills alone cannot lead humanity to a happy and dignified life. Humanity has every reason to place the proclaimers of high moral standards and values above the discoverers of objective truth.

Everything that can be counted does not necessarily count; everything that counts cannot necessarily be counted.

In every true searcher of Nature there is a kind of religious reverence, for he finds it impossible to imagine that he is the first to have thought out the exceedingly delicate threads that connect his perceptions