Marcus Serven explains in this video that sanctification involves a lot of things. Part of it involves discipleship in encouraging fellow brothers and sisters to grow in their faith. It involves the idea that each Christian is connected to each other and that there needs to be accountability amongst believers. There needs to be a willingness to talk to others about sin and confront sin if needed.

1 Corinthians 12:13 (NKJV) - "For by one Spirit we were all baptized into one body—whether Jews or Greeks, whether slaves or free—and have all been made to drink into one Spirit."

Sanctification can cut two different ways and one way can be discipleship, where we're encouraging and supporting and helping other Christians to grow further or go further in the gospel and to grow in a deeper way. On the other hand, sanctification can mean that we're speaking into one another's lives and, as it were, challenging one another when a brother or sister is going astray. So in our culture, we have the idea, and it's deeply ingrained in our democratic idealism that's so much part and parcel of our way of thinking. We hardly have to even think too hard about it. It's such an assumption in our life that every man's an island and stay out of my life and I'm going to do what I want to do.

I'm going to make all my own decisions. But scripture portrays it very differently. Think, for example, of all the one another commands in the Bible, in the New Testament in particular, I've counted up roughly about 25 to 30 of them. Every once in a while I find a new one, I keep adding it to my list of all the one anothers, and that implies that we're all connected to one another. It's not this every man's an island approach.

It's not this, well, I'm fulfilling my own destiny, stay out of my life, I'm going to do what I want with no accountability, and I'm going to be completely autonomous from the rest of all Christians. That's a false view, but instead we have the idea that we're part of a body of believers and we're connected. And that implies that we're going to be involved in the nitty-gritty parts of our life where We're actually getting our hands a little bit dirty sometimes in being willing to say to our brother or our sister that there's an area that I'm concerned about in your life and I'd like to talk to you about it.