There is no shame in not knowing; the shame lies in not finding out.

Russian proverb

People who think they know everything are a great annoyance to those of us who do.

Isaac Asimov

What is firmly rooted cannot be pulled out.

Lao Tzu

Fall down seven times, get up eight.

Japanese Proverb

Whatever you are, be a good one.

Abraham Lincoln

Why kill time when one can employ it.

French Proverb