At the root of all the harm we cause is ignorance.

I do see one large and grievous kind of ignorance, separate from the rest, and as weighty as all the other parts put together. Thinking that one knows a thing when one does not know it. Through this, I believe, all the mistakes of the mind are caused in all of us.

Ignorance est mère de tous les maux.

The biggest mistake most people make is to not see themselves and others objectively, which leads them to bump into their own and others’ weaknesses again and again. People who do this fail because they are stubbornly stuck in their own heads.

Ignorance is the parent of fear

Ignorance more frequently begets confidence than does knowledge.

Ignorance is fatal.

Ignorance, the root and stem of every evil.

Most errors in judgment happen when we don’t know we’re supposed to be exercising judgment.

Ignorance is the parent of fear.

Ignorance is the parent of fear ...

Avoidable human misery is more often caused not so much by stupidity as by ignorance, particularly our ignorance about ourselves.

...the biggest mistake people make is not acknowledging fear and uncertainty.

It is worse still to be ignorant of your ignorance.