WHAT FORTUNE CAN EFFECT IN HUMAN AFFAIRS AND HOW TO
WITHSTAND HER
[...]
Changes in estate also issue from this, for if, to one who governs
himself with caution and patience, times and affairs converge in such a
way that his administration is successful, his fortune is made; but if
times and affairs change, he is ruined if he does not change his course
of action. But a man is not often found sufficiently circumspect to know
how to accommodate himself to the change, both because he cannot deviate
from what nature inclines him to do, and also because, having always
prospered by acting in one way, he cannot be persuaded that it is well
to leave it; and, therefore, the cautious man, when it is time to turn
adventurous, does not know how to do it, hence he is ruined; but had he
changed his conduct with the times fortune would not have changed.
"The Prince", Nicolo Machiavelli