But Moses’ hands were heavy . . . and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun. Exodus 17.12.
Each of us is but one member of the body of Christ, and consequently we cannot live without the protection of other brothers and sisters. Even Moses’ hands needed the support of Aaron and Hur. If even Moses needed the support of other members, what about us?

The gates of Hades cannot prevail against the church. This very thing the Lord Jesus himself promised and declared (see Matt. 16.18). Yet our Lord has never promised God’s children that they could be independent or leave the church. Spiritual warfare is not a personal affair, it is a body task. And hence, in order to obtain the needed protection, we must go to the brethren. Let us never think of ourselves as individually competent and “go it alone.”