One is unable to notice something because it is always before one's eyes.

Ask yourself whether our language is complete--whether it was so before the symbolism of chemistry and the notation of the infinitesimal calculus were incorporated in it; for these are, so to speak, suburbs of our language. (And how many houses or streets does it take before a town begins to be a town?) Our language can be seen as an ancient city: a maze of little streets and squares, of old and new houses, and of houses with additions from various periods; and this surrounded by a multitude of new boroughs with straight regular streets and uniform houses.

For a truly religious man nothing is tragic.

What is left over if I subtract the fact that my arms goes up from the fact that I raise my arm?

We feel that even if all possible scientific questions be answered, the problems of life have still not been touched at all.

Suppose someone follows the series "1,3,5,7, ..", and in writing the series 2x+1; and he asked himself "But am I always doing the same thing, or something different every time?" If from one day to the next someone promises: "Tomorrow I will give up smoking", does he say the same thing every day, or every day something different?

Death is not an event in life: we do not live to experience death.