Those who lack all idea that it is possible to be wrong can learn nothing except know-how.

Numbers are the product of counting. Quantities are the product of measurement. This means that numbers can conceivably be accurate because there is a discontinuity between each integer and the next. Between two and three there is a jump. In the case of quantity, there is no such jump; and because jump is missing in the world of quantity, it is impossible for any quantity to be exact. You can have exactly three tomatoes. You can never have exactly three gallons of water. Always quantity is approximate.

The meaning of your communication is the response you get.

It is impossible, in principle, to explain any pattern by invoking a single quantity.

Most of us have lost that sense of unity of biosphere and humanity which would bind and reassure us all with an affirmation of beauty. Most of us do not today believe that whatever the ups and down of detail within our limited experience, the larger whole is primarily beautiful.

Multiple descriptions are better than one.

No organism can afford to be conscious of matters with which it could deal at unconscious levels.