It is not our place to judge when a brother or sister falls from God. We should do as Paul said. We should help to restore them and not forget that the same thing could happen to us if we are not careful. The last thing someone needs to hear when they have fallen, is condemnation. Instead, they need to be reassured of God's love, His care and His power to restore them.
Verse 2 says that we are to bear one another's burdens. When we see a brother or sister who are hurting, we should help them anyway we can. We need to pray on their behalf. This world would be a better place to live in if we fulfilled what the Apostle Paul said. If instead of kicking our brother or sister when they are down, we help them. We never know when we will need someone's help through a difficult situation in our own lives. May we always be willing to help any brother or sister who has fallen.