We must be skeptical even of our skepticism.

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.

Humanistic ethics is based on the principle that only humans themselves can determine the criterion for virtue and not an authority transcending us.

Among the Tibetans, one wife has many husbands, because men are too poor to support a whole wife.

Any pleasure that does no harm to other people is to be valued.

We know very little, and yet it is astonishing that we know so much, and still more astonishing that so little knowledge can give us so much power.

It is preoccupation with possessions, more than anything else, that prevents us from living freely and nobly.