The last signs of spiritual immaturity considered were:
8. Relying on outward appearances
9. Sectarianism
10. Having a grumbling, ungrateful spirit
11. Legalism

Relying on outward appearances
Teenagers tend to put a lot of emphasis on outward appearances, especially regarding fashion and make-up. They judge themselves and other people by how they look. This is not how God judges, however, for ‘The LORD does not look at the things people look at. People look at the outward appearance, but the LORD looks at the heart.’ (1 Sam 16:7) What is truly important (and far harder to judge!) is the state of the heart. (see Prov 4:23) Actions flow from the heart attitude (Luke 6:45), but we need to be careful not to judge by appearances and certainly not to prefer those who seem outwardly to be more successful. (James 2:2-4)

Sectarianism
Sectarianism means ‘bigotry, discrimination, or hatred arising from attaching importance to perceived differences between subdivisions within a group.’ Although often used to describe the divisions between Catholics and Protestants in Northern Ireland, the term looks deeper into the way we tend to isolate people who are different to us. There is no place for cliques or bigotry and discrimination in church life, for we are commanded to accept each other as Christ has accepted us. (Rom 15:7) Discrimination is gone (Gal 3:26-29) and love has to be our new motivation in all relationships.When we are mature, we learn to value each other, even learning to appreciate each other’s differences and diversity, because we recognise that each part is being fitted together by God to form the whole.

Having a grumbling, ungrateful spirit
Since we have said thankfulness is a sign of spiritual maturity (1 Thess 5:18, Eph 5:20), it is obvious that the opposite is a sign of spiritual immaturity. The Israelites were condemned for their grumbling in the wilderness (see Ps 78, 1 Cor 10:1-5) and missed out on entering the Promised Land because of how this attitude led to a refusal to believe and obey God. The challenge is for us to be thankful where we are, allowing contentment to be formed within us.

Legalism

It is so easy for us to start by means of the Spirit and then to try to live in the flesh. (see Gal 3:3) God is looking for people who will walk by faith and not by sight and who will live according to the Spirit, not according to the flesh (Rom 8:1-17). Life is not about ‘painting by numbers’ and this walking by faith will always involve risk, uncertainty and dependence on God. When we mature, we understand that it is not about living by rules, but about living by faith, which pleases God.