I'm currently reading Iain H. Murray's Wesley and Men Who Followed. A suprising quote from Wesley that I read today follows:
"Supposing a man be now void of faith and hope and love, he cannot effect any degree of them in himself by any possible exertion of his understanding, and of any or all of his other natural faculties, though he should enjoy them to the utmost perfection. A distinct power from God, not implied in any of these, is indipsensably necessary before it is possible he should arrive at the very least degree of Christian faith, or hope, or love. In order to his having any of these (which on this very consideration I suppose St Paul terms 'the fruits of the Spirit') he must be created anew, throughly and inwardly changed by the operation of the Spirit of God, by a power equivalent to that which raises the dead, and which calls things which are not as though they were."