The scientist is not a person who gives the right answers, he is one who asks the right questions.

Nor must we forget that in science there are no final truths.

Our students wanted to know everything: but only the newest theory seemed to them worth bothering with. Knowing nothing of the intellectual achievements of the past, they kept fresh and intact their enthusiasm for 'the latest thing'. Fashion dominated their interest: they valued ideas not for themselves but for the prestige that they could wring from them.

For everything is history: What was said yesterday is history, what was said a minute ago is history. But, above all, one is led to misjudge the present, because only the study of historical development permits the weighing and evaluation of the interrelationships among the components of the present-day society.

The musical emotion springs precisely from the fact that at each moment the composer withholds or adds more or less than the listener anticipates on the basis of a pattern that he thinks he can guess, but that he is incapable of wholly divining. If the composer withholds more than we anticipate, we experience a delicious falling sensation; we feel we have been torn from a stable point on the musical ladder and thrust into the void. When the composer withholds less, the opposite occurs: he forces us to perform gymnastic exercises more skillful than our own.

The world began without man, and it will complete itself without him.

How can my old photographs fail to create in me a feeling of emptiness and sorrow? They make me acutely aware that this second deprivation will be final this time.