Most unintelligent or foolish people do not regard themselves as that; they regard themselves as not-that-intelligent or not-that-wise.

Nothing complements a fast mind better than a slow tongue. And nothing aggravates a slow mind better than a fast tongue.

Those who are really intelligent or wise do not mind coming across as stupid or foolish.

The kind of lies that someone tells us gives us an idea of how stupid, knowledgeable, intelligent, or ignorant they are … or they think we are.

We sometimes unknowingly reveal that we are stupid by wondering aloud why, if they are really wise or intelligent, is someone not rich or famous.

As if their not being smart were not unfortunate enough, most people think they are smart.

We sometimes pretend to agree with a statement, as an attempt to hide the fact that we are not smart enough to understand it.