When we give our lives over to Christ and choose to follow Him we give up the way we use to live our lives. Colossians 3:1-17 talks about putting to death everything that is earthly in us. This sounds easier said than done, and rightly so if we attempt putting to death our earthly desires on our own. But we weren't designed to live this life alone. The saying that, "there is strength in numbers," applies to our lives as we live for Christ. In the same passage about putting to death our desires it also says in verse 16, "Let the word of Christ dwell in you richly, teaching and admonishing one another in all wisdom." Joining a small group gives you the opportunity to live out Christianity by bearing each your burdens with other Christians as we all are putting to death those earthly desires within us.
But it doesn't stop at accountability. Small groups don't stop with us only holding one another accountable. We need encouragement. Through encouragement we build one another up so that we have strength to persist through the difficulties that we face. Living for Christ isn't always easy, but that's why God gave us each other.
Water serves many purposes. Of all it's purposes, the most important of which is that water brings life. We need water to live. The same is true for us as Christians, but our water is the Word. Joining a small group is refreshing. It's an opportunity to learn more about living for Christ. We need the Word so that we can grow as Christians. The thing that is so amazing about water is that, if there is enough of it, it can carve through mountains and terrain. The water that we drink, the Word of God, is just like that water. When we have it behind us it will cut through anything.