I am not bigoted enough for a system-and not even for my system.

It is perhaps just dawning on five or six minds that physics, too, is only an interpretation and exegesis of the world (to suit us, if I may say so!) and not a world-explanation.

Knowledge kills action; action requires the veils of illusion.

Out of a brotherly love we occasionally embrace this or that somebody (because we cannot embrace everybody): but we must never letour somebody know it.

We believe that we know something about the things themselves when we speak of trees, colors, snow, and flowers; and yet we possess nothing but metaphors for things - metaphors which correspond in no way to the original entities.

To forget one's purpose is the commonest form of stupidity.

The hypocrite who always plays one and the same part ceases at last to be a hypocrite.