"The ways of God are straight.
The tzaddik uses them for progress;
The rebel comes to failure by them."
The ways of God are straight. There should be no possibility of taking the wrong turn. There are no turns. But if one does not want the truth... If one rebels... Even the ways of God, even the precious gifts of God can lead to failure.
When one is making progress in the life of the spirit many doors open before him. But there is no standing still. If one thinks one is standing still, in truth he is falling. This is our situation. We are falling continuously, but we don't know it. There is nothing worse that this.
The very "ways of God" used by the tzaddik as a means of progress lead to failure when used by the rebel. Everything is a test. The very means given by God to achieve aliyah- spiritual ascent -can be used by the yetzer ha-ra for the opposite.
(Michtav Me'Eliyahu, Rabbi Eliyahu E Dessler)