I found this on the Spirituality and Practice site:
Grace confounds certain very natural human tendencies. We want to believe we are in control. We assume there are specific moves we can take to ensure that we are rewarded. We expect God's gifts to be doled out according to some recognizable plan.
But grace does not work that way. Instead, it teaches us to let go and let God. Not only are we not in charge, we don't have to be. We just need to stay open to receiving the sacred.