2 Chronicles 20:15 ...Be not afraid or dismayed by reason of this great multitude; for the battle is not yours but God's. For the battle is not ours but the Lord means that we are walking not in our own strength, but in the strength provided by God. It also means we are using the weapons of spiritual warfare which also includes speaking truth, living righteously, sharing the gospel, being faithful, knowing God's word and praying every day.