People like you and I, though mortal of course like everyone else, do not grow old no matter how long we live.... [We] never cease to stand like curious children before the great mystery into which we were born.

Intellectual growth should commence at birth and cease only at death.

How strange is the lot of us mortals! Each of us is here for a brief sojourn;for what purpose we know not, though sometimes sense it. But we know from daily life that we exist for other people first of all for whose smiles and well-being our own happiness depends

The strange things about growing old is that the intimate identification with the here and now is slowly lost. One feels transposed into infinity, more or less alone.

He who finds though that lets us penetrate even a little deeper into the eternal mystery of nature has been granted great grace. He who, in addition, experiences the recognition, sympathy, and help of the best minds of his times, had been given almost more happiness than one man can bear

The most beautiful experience we can have is the mysterious - the fundamental emotion which stands at the cradle of true art and true science. Living Philosophies, 1931