Holiness is an attribute of God. It is not something we human beings have on our own, but something that must be imparted to us from God. Nevertheless, Christians have long believed that there are practices by which we open ourselves to the gift of holiness.
When Wesley said that there is no holiness but social holiness, what he meant was that we need other people to help us become open to God’s sanctifying grace that makes us holy. We can’t do this all on our own. Thus we see the development of class and band meetings in early Methodism.
Kevin Watson has an excellent book on the class meeting. I highly recommend it. You can find it here in print and here as an e-book. Now Kevin and my colleague Scott Kisker have written a new book on the band meeting, available here in print and here as an e-book. What is a band meeting? It is a group of men or women who come together to confess their sins to each other and hold one another accountable in repentance. Class meetings were mandatory for the early Methodists, though band meetings were not. Rather, they were for those who wanted to go deeper in their quest for holiness. This is a very good book, and I recommend it for your personal reading or, even better, as a small group study in a church.