1 Samuel 17:45
And David said to the philistine, you are coming to me with sword, and with spear, and with javelin. But I am coming to you in the name of Yahweh of Hosts, the Elohim of the armies of Israel, which you have reproached.
Saul was a man of war; David was a shepherd boy. Saul knew the Father; David trusted the Father. Saul wore physical armor; David wore the armor of Yahweh.
Many times, in life the enemy attacks using physical things and people who seem so much bigger than us, but if we put on the armor of Yahweh every day we can say to the enemy as David did in 1 Samuel 17:45, you come at me with this, but I come to you in the name of Yahweh of Hosts while believing in our hearts the battle is already won.
Remember: He that is in you is bigger than he that is in the world.