don't drive faster than your guardian angel can fly

Proverb

 * 1) Drive your vehicle at a safe speed.
 * 2)  Do not rush impulsively into things or get carried away by your emotions.
 * 1)  Do not rush impulsively into things or get carried away by your emotions.
 * 1)  Do not rush impulsively into things or get carried away by your emotions.
 * 1)  Do not rush impulsively into things or get carried away by your emotions.

Usage notes
When used to refer to driving speed, it is typically also used for the more metaphoric sense at the same time.