Definitely the principle of being planted somewhere and growing/prospering. There have been many times during my life when something has happened or I've had to make a decision and often it could have uprooted me and taken me somewhere else, but actually staying put where God has you is hugely important. I wouldn't have had the opportunities that I have had if I had not stayed at Breakthrough. God wants to bless us and increase us and that will happen when we are planted and being obedient to His call.
I love life groups! It's so amazing to be doing life with close friends that you can connect with outside of church on Sunday. Having people who understand you and care about you and what you're going through in life is such a blessing and I'll never not want to be in life groups. Specifically though you realize that the same people are often going through what you are or have dealt with it before so they can give such encouragement and God thoughts and perspectives that I wouldn't have considered had I not shared personally with them. Not only helps me in my faith, but it builds really good and close bonds that I know are for life. I wouldn't be who I am or where I am without my life group.