"Do not feel certain of anything."
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"Do not feel certain of anything."
"The pleasure of work is open to anyone who can develop some specialised skill, provided that he can get satisfaction from the exercise of his skill without demanding universal applause."
"Science tells us what we can know, but what we can know is little, and if we forget how much we cannot know we become insensitive to many things of great importance."
"Philosophy seems to me on the whole a rather hopeless business."
"The essence of life is doing things for their own sakes."
"Even in civilized mankind faint traces of monogamous instinct can be perceived."
"All great books contain boring portions, and all great lives have contained uninteresting stretches."
"Envy ... is one form of a vice, partly moral, partly intellectual, which consists in seeing things never in themselves but only in their relations."
"Inferences of Science and Common Sense differ from those of deductive logic and mathematics in a very important respect, namely, when the premises are true and the reasoning correct, the conclusion is only probable."
"Americans need rest, but do not know it."
"To the primitive mind, everything is either friendly or hostile; but experience has shown that friendliness and hostility are not the conceptions by which the world is to be understood."
"Upon hearing via Littlewood an exposition on the theory of relativity: To think I have spent my life on absolute muck."
"In attempting to understand the elements out of which mental phenomena are compounded, it is of the greatest importance to remember that from the protozoa to man there is nowhere a very wide gap either in structure or in behaviour. From this fact it is a highly probable inference that there is also nowhere a very wide mental gap."
"I often long to . . . give up my life to love of my neighbour. This is really a temptation."