Have both feet on the ground.
More Traditional Proverbs:
Quicker by taking more time.Traditional
It is better to travel alone than with a bad companion
Traditional
A sane person has difficulty in insane surroundings.
Traditional
Throw out a herring to catch a whale.
Traditional
Give advice if people don't listen, let adversity teach them
Traditional
It's not what you know, it's how fast you can find it.
Traditional