The Warrior Attitudes for Relationship Growth come from 2 Timothy. The highlighted verses describe the attitudes of the stage of intimacy with God where we are soldiers of the Captain of the Lord of Hosts.
Soldier is the 4th level of intimacy we can grow to. (A Sheep of the Good Shepherd, A Slave (Doulos) of the Master, and A Subject of the King of kings, are the lower levels. We are not able to live as a soldier until we have adopted the attitudes of the first 3.