When people have a hard task to do - one which stretches them - they become less concerned with trivial matters.

... when we are talking about 'Christians' and 'Moslems' we must first make sure that we are talking about people who have an idea, which should be more or less correct, as to what the other is supposed to believe and what he is expected to do as a consequence of that belief.

When tomorrow comes, think tomorrow's thoughts.

Advice is priceless: when it becomes interference it is preposterous.

There is a Persian proverb: 'To test that which has been tested is ignorance.' To try to test something without the means of testing is even worse.

The colour of the water seems to be the colour of the glass into which it has been poured'.

Please, not again what you studied, how long you spent at it, how many books you wrote, what people thought of you - but: what did you learn?