John Wesley offers us an interesting both/and view of the Christian life.
He has a strong doctrine of grace and the grace-powered life in Christ. He inspired the holiness and Pentecostal doctrines of the second blessing and the belief in the power of grace to make deep changes in the soul, mind, and spirit of the believer in an instant. As it has been written about him, he was extremely optimistic about grace.
And at the same time, Wesley had an interesting psychology of holiness. In sermons such as “On Zeal” he writes about the way Christians cultivate “holy tempers” — or character traits — by habit. It is by doing good, that we become good.
So in him, you can find an argument both for the notion that we need a powerful pouring out of grace for our depraved and wicked hearts to be made good and the idea that we develop the character to live in Christian holiness by habit and practice that molds us into different people.
I’ve not studied this with extreme care, but I do think I am at least in the vicinity of correct in this observation. For some, I imagine, this is yet another reason to view Wesley theology as an unsystematic mess. I tend to view it as a sign that he did not let intellectual boxes get in the way of pastoral wisdom.