Because of the victory of Jesus our position is no longer one of striving but of standing. Jesus has won the victory, now we stand in the shadow and triumph of the cross. The enemy can throw tantrums but because of calvary no longer does it have power. We don't have to strive any longer, we have been released to stand, and when all else fails "to stand".
Ephesians 6 : 10 - 15
10 Finally, be strong in the Lord and in his mighty power. 11 Put on the full armor of God, so that you can take your stand against the devil’s schemes. 12 For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms. 13 Therefore put on the full armor of God, so that when the day of evil comes, you may be able to stand your ground, and after you have done everything, to stand. 14 Stand firm then, with the belt of truth buckled around your waist, with the breastplate of righteousness in place, 15 and with your feet fitted with the readiness that comes from the gospel of peace.