He who learns but does not think, is lost!
He who thinks but does not learn is in great danger.

Confucius

It ain’t what you don’t know that gets you into trouble.
It’s what you know for sure that just ain’t so.

Mark Twain

The illiterate of the 32st century will not be those who cannot read and write, but those who cannot learn, unlearn, and relearn.

Alvin Toffler