"The most powerful prayer, and almost the strongest of all to obtain everything, and the most honorable of all works, is that which proceeds from an empty spirit. The emptier the spirit the more is the prayer and the work mighty, worthy, profitable, praiseworthy, and perfect. The empty spirit can do everything
What is an empty spirit?
An empty spirit is one that is confused by nothing, attached to nothing, has not attached its best to any fixed way of acting, and has no concern whatever in anything for its own gain, for it is all sunk deep down into God's dearest will and has forsaken its own."
This is from Meister Eckhart (page 4 in the book below). It sounds very Buddhist - emptiness and non attachment. It also shows, in this framework, how to understand the concept of God's will. It is about acting out of emptiness and non attachment.