One of the consistent messages was that we could not lead on our own. Certainly we have to lead through the strength of Christ, but we also need to link shields with other men who are committed to Christ and engaged in the same battle to lead.
Much of the Bible speaks of this; there are examples in both testaments. But if you look at 2 Corinthians 16:13 you get a flavor for why Paul wrote what he did. That is the encouragement that permeates all of his letters.
We have each been gifted. According to Romans 12, 1 Corinthians 12, and Ephesians 4:11 – 16, that gifting is to build one another up. To link shields and to hold each other up in battle, in leading.
If we do not do our part. The wall fails.