1. Accept those whose faith is weak (1-9)
We are never to judge others because of the level of their faith. Some people are going to have weaker faith than we do. Others might have stronger faith than us. Some will have a different faith than us, viewing some days as more or less holy than we do. We should accept our brothers and sisters no matter where they are in their walk of faith. Especially, as long as our differences are on disputable matters, we should love and accept each other. We all belong to the Lord, whatever we do. It was for this very reason that Christ died for us, so that he might be the Lord of both the dead and the living.
2. We will give an account of ourselves to God (10-12)
One day, we will all find ourselves before the judgement seat of God. We will all be judged. So, why would we look down on our brother or sister? We are told elsewhere not to judge because we are guilty of the same things. We will stand before God one day and have to give an account of our actions, behavior and words. So rather than worrying about what our brother or sister is doing, we should worry about doing what pleases God.