It's always too early to quit.
Well done is better than well said.
Go for it now. The future is promised to no one.
Always desire to learn something useful.
Who seeks shall find.
Without hard work, nothing grows but weeds.
Do not weep do not wax indignant. Understand.
Be thine own palace, or the world's thy jail.
Only the educated are free.
Either you run the day or the day runs you.
As a rule, software systems do not work well until they have been used, and have failed repeatedly, in real applications.
Whenever anyone says, 'theoretically,' they really mean, 'not really.'