You never know what motivates you.
Things do not happen. Things are made to happen.
Be thine own palace, or the world's thy jail.
It's always too early to quit.
Expect problems and eat them for breakfast.
If you think you can do it, you can.
What you do today can improve all your tomorrows.
Always desire to learn something useful.
If you're going through hell, keep going.
Be gentle to all and stern with yourself.
Doubt is an uneasy and dissatisfied state from which we struggle to free ourselves and pass into the state of belief while the latter is a calm and satisfactory state which we do not wish to avoid, or to change to a belief in anything else.