"an ecstasy of priestcraft,..."See in text(Text of Chesterton's Essay)
Chesterton crafts an original phrase here—an “ecstasy of priestcraft.” “Ecstasy” refers to a state of immense joy, literally an out-of-body experience. “Priestcraft” refers to the functions performed by clergy. Chesterton suggests that the “Success” mongers relate to their millionaire idols with the same crazed joy with which priests relate to their God and the attendant mysteries of divinity.