Right conduct can never, except by some rare accident, be promoted by ignorance or hindered by knowledge.

People who are vigorous and brutal often find war enjoyable.

A truer image of the world, I think, is obtained by picturing things as entering into the stream of time from an eternal world outside, than from a view which regards time as the devouring tyrant of all that is.

What is best in mathematics deserves not merely to be learnt as a task, but to assimilated as a part of daily thought, and brought again and again before the mind with ever-renewed encouragement.

There is no logical impossibility in the hypothesis that the world sprang into being five minutes ago, exactly as it then was, with a population that "remembered" a wholly unreal past. There is no logically necessary connection between events at different times; therefore nothing that is happening now or will happen in the future can disprove the hypothesis that the world began five minutes ago.

Many a marriage hardly differs from prostitution, except being harder to escape from.

Zeno was concerned with three problems... These are the problem of the infinitesimal, the infinite, and continuity.