We know that the kingdom of God is the rule of God through the truth of God superimposed on a world that rebels against the rule and contradicts the truth. Christians live precisely where the kingdom of God collides with this present age. Live like men. It isn't to be superhuman. Merely to try to be superhuman is to make oneself sick.
Scripture understands strength chiefly in terms of steadfastness.
The Roman armies of old weren't noted for their capacity to crush the enemy at one blow. Roman armies of old were noted rather for their steadfastness, their resilience, their persistence, their dependability. To be steadfast is to be immovable, not given to flight or frivolity. To be steadfast is to be resolute, not able to be intimidated or routed. The peculiar sort of strength that scripture upholds is known as meekness.