It's always too early to quit.
If you're going through hell, keep going.
To know oneself, one should assert oneself.
Who seeks shall find.
If you've got a talent, protect it.
By failing to prepare, you are preparing to fail.
Always desire to learn something useful.
The wise does at once what the fool does at last.
Never complain and never explain.
Go for it now. The future is promised to no one.
The whole essence of good drawing - and of good thinking, perhaps - is to work a subject down to the simplest form possible and still have it believable for what it is meant to be.