It's always too early to quit.
Well done is better than well said.
The dog that trots about finds a bone.
The wise does at once what the fool does at last.
Be thine own palace, or the world's thy jail.
If you think you can do it, you can.
Know or listen to those who know.
Never complain and never explain.
After a storm comes a calm.
The most effective way to do it, is to do it.
If the highest things are unknowable, then the highest capacity or virtue of man cannot be theoretical wisdom.