If God be for you, then who can be against you? It is always nice to have someone in your corner that has credit or weight in any given situation you may face. To have someone vouch for your credibility with their good credit.
When we do not have the collateral to get what we are looking for, they ask for a co-signer. The Father co-signs for us when the Blood of the Lamb is covering us. Without our Lord Christ as our mediator and the one to stand in for us in proxy for sins. We all would have to still answer for our sinful acts. The only action that God can take is death upon us.
So, we keep ourselves humble as we serve in this army of God. We do not walk around here boosting if our exploits in the faith. God should always be glorified for what He has allowed us to do in His service.
When we talk ourselves up in front of men, we do not understand that we are trying to steal the Glory that belongs to the Lord. We know that it is only because He has empowered us through the work of the Holy Spirit to reach the world in His name.
no man should boast about what he/she accomplishes. It is not right to take the Glory of what God has done and claiming as your own.