David was given an armor. A good armor. The King's armor. It worked for Saul. (At least till Goliath entered the picture.)
He rejected it. For the single reason that it wasn't familiar.
Then He went to the brook And CHOSE 5 SMOOTH stones for HIMSELF
Here’s a formula for picking scriptures for war with from David's story.
1. A powerful sword gains power in the hands of a powerful warrior. A useless spear is useless because of the lack of skill of the thrower.
A thread