Quote from A Course in Miracles Text Chapter 14 - TEACHING FOR TRUTH.

T-14.XI.15. The power of God, from which they both arise, is yours as surely as it is His. 2 You think you know Him not, only because, alone, it is impossible to know Him. 3 Yet see the mighty works that He will do through you, and you must be convinced you did them through Him. 4 It is impossible to deny the Source of effects so powerful they could not be of you. 5 Leave room for Him, and you will find yourself so filled with power that nothing will prevail against your peace. 6 And this will be the test by which you recognize that you have understood.