Begin to be now what you will be hereafter.
Never complain and never explain.
Be thine own palace, or the world's thy jail.
Things do not happen. Things are made to happen.
Expect problems and eat them for breakfast.
To be a good loser is to learn how to win.
It's always too early to quit.
Go for it now. The future is promised to no one.
The most effective way to do it, is to do it.
Without hard work, nothing grows but weeds.
The capacity you're thinking of is imagination without it there can be no understanding, indeed no fiction.