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.