The worst of all deceptions is self-deception.

Putting the shoe on the wrong foot.

If in a discussion of many matters ... we are not able to give perfectly exact and self-consistent accounts, do not be surprised: rather we would be content if we provide accounts that are second to none in probability.

There are some whom the applause of the multitude has deluded into the belief that they are really statesmen.

That's what education should be," I said, "the art of orientation. Educators should devise the simplest and most effective methods of turning minds around. It shouldn't be the art of implanting sight in the organ, but should proceed on the understanding that the organ already has the capacity, but is improperly aligned and isn't facing the right way.

Take charge of your thoughts. You can do what you will with them

No human thing is of serious importance.