"Since we cannot know all that there is to be known about anything, we ought to know a little about everything."

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We think so because all other people think so; Or because-or because-after all, we do think so; Or because we were told so, and think we must think so; Or because we once thought so, and think we still think so; Or because, having thought so, we think we will think so.

— Henry Sidgwick