From the book "Foundation and Empire"

There is a difference between boldness and blindness. There is a place for a decisive gamble when you know your enemy and can calculate the risks at least roughly; but to move at all against an unknown enemy is boldness in itself. You might as well ask why the same man sprints safely across an obstacle course in the day, and falls over the furniture in his room at night.

Isaac Asimov (1920–1992)
Author and biochemist