It's always too early to quit.
To know oneself, one should assert oneself.
Well done is better than well said.
Never complain and never explain.
Either you run the day or the day runs you.
Go for it now. The future is promised to no one.
Things do not happen. Things are made to happen.
Who seeks shall find.
Only the educated are free.
Be kind whenever possible. It is always possible.
A mathematician is a person who can find analogies between theorems a better mathematician is one who can see analogies between proofs and the best mathematician can notice analogies between theories.