Big-picture thinkers broaden their outlook by striving to learn from every experience. They don't rest on their successes, they learn from them.
If you want to do something really big, do it as part of a team.
A big man is one who makes us feel bigger when we are with him.
If you think you are the entire picture, you will never see the big picture.
If you want to do a few small things right, do them yourself. If you want to do great things and make a big impact, learn to delegate.