Coincidence may be described as the chance encounter of two unrelated causal chains which - miraculously, it seems - merge into a significant event.

Aggressiveness is not the main trouble with the human species, but rather an excess capacity for fanatical devotion.

In my youth I regarded the universe as an open book, printed in the language of equations, whereas now it appears to me as a text written in invisible ink, of which in our rare moments of grace we are able to decipher a small segment.

Snobbery is not merely a silly human weakness but something basic in the mentality of modern man-a symptom which reflects the general sickness, the dislocation of social and cultural values in contemporary civilization.

Of all forms of mental activity, the most difficult to induce even in the minds of the young, who may be presumed not to have lost their flexibility, is the art of handling the same bundle of data as before, but placing them in a new system of relations with one another by giving them a different framework, all of which virtually means putting on a different kind of thinking-cap for the moment. It is easy to teach anybody a new fact...but it needs light from heaven above to enable a teacher to break the old framework in which the student is accustomed to seeing.

Laughter and weeping, the Greek masks of comedy and tragedy, mark the extremes of a continuous spectrum; both provide channels for the overflow of emotion; both are

In any language it is a struggle to make a sentence say exactly what you mean.