It probably means that when someone has Betachon Hashem helps him, not because of Zechusim, only as a product of his having Betachos. When you drink a cold drink you get cooled off as a product of your actions, not due to a decision in heaven to cool you off. The same is with Betachon.
Knowing this allows you to have Betachon, since you won’t be thinking how will Hashem help you if you aren’t this great Tzaddik. In fact, when we Daven, we always ask that Hashem help because He is a Shomea Teffila, not because of our personal merit — which we are never that sure about.