All have disappointments, all have times when it isn't worthwhile.
You spend so much time in your profession it ought to be something you love.
I believe the greater the handicap, the greater the triumph.
Dream small dreams. If you make them too big, you get overwhelmed and you don't do anything. If you make small goals and accomplish them, it gives you the confidence to go on to higher goals.
It's not what the dream is but what the dream does.
To succeed, one must be creative and persistent.