When two great powers disagree about anything - it doesn't matter what - they must find a way to settle it somehow by arbitration or by negotiation, not by war or threat of war.

Patience and boredom are closely related. Boredom, a certain kind of boredom, is really impatience. You don't like the way things are, they aren't interesting enough for you, so you deccide- and boredom is a decision-that you are bored.

Philosophy is to be studied, not for the sake of any definite answers to its questions, since no definite answers can, as a rule, be known to be true, but rather for the sake of the questions themselves; because these questions enlarge our conception of what is possible, enrich our intellectual imagination and diminish the dogmatic assurance which closes the mind against speculation; but above all because, through the greatness of the universe which philosophy contemplates, the mind is also rendered great, and becomes capable of that union with the universe which constitutes its highest good.

From India to Spain, the brilliant civilization of Islam flourished. What was lost to christendom at this time was not lost to civilization, but quite the contrary.

Science is no substitute for virtue; the heart is as necessary for a good life as the head.

Although this may seem a paradox, all exact science is dominated by the idea of approximation. When a man tells you that he knows the exact truth about anything, you are safe in inferring that he is an inexact man. Every careful measurement in science is always given with the probable error ... every observer admits that he is likely wrong, and knows about how much wrong he is likely to be.

A smile happens in a flash, but its memory can last a lifetime.