It's always too early to quit.
Things do not happen. Things are made to happen.
Always desire to learn something useful.
Problems are not stop signs, they are guidelines.
After a storm comes a calm.
The dog that trots about finds a bone.
Do not weep do not wax indignant. Understand.
If you can dream it, you can do it.
I can, therefore I am.
If you're going through hell, keep going.
As man sows, so shall he reap. In works of fiction, such men are sometimes converted. More often, in real life, they do not change their natures until they are converted into dust.
There's time enough, but none to spare.