Just as the individual is not alone in the group, nor anyone in society alone among the others, so man is not alone in the universe.

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

Enthusiastic partisans of the idea of progress are in danger of failing to recognize the immense riches accumulated by the human race. By underrating the achievements of the past, they devalue all those which still remain to be accomplished.

Not all poisonous juices are burning or bitter nor is everything which is burning and bitter poisonous.

The wise man doesn't give the right answers, he poses the right questions.

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

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.