It is doubly unfortunate to be ignorant or stupid … and confident.

Arrogance gives confidence … a bad name.

Stupidity is intensified by things such as arrogance and confidence.

Some people hate people who are overconfident, only because their overconfidence reminds them of their underconfidence.

Our arrogance as a species is only a few degrees away from us claiming that we invented, not discovered, fire.

We ought to limit what we confidently say we will never do to what we cannot and will never be able to do.

Small-mindedness is intensified by things such as big-headedness.

Knowing more than someone does not necessarily mean that you know every single thing they know.

An arrogant man whose arrogance we see from his own behaviour is more tolerable than a humble man whose humility we hear of from his own mouth.