Proving Your Armour

This morning I read 1 Samuel 14 - 17, my daily Proverb, and a few chapters in Psalms.  This stood out to me in 1 Samuel 17:

³⁸ And Saul armed David with his armour, and he put an helmet of brass upon his head; also he armed him with a coat of mail.
³⁹ And David girded his sword upon his armour, and he assayed to go; for he had not proved it. And David said unto Saul, I cannot go with these; for I have not proved them. And David put them off him.

 Before you can use the weapons of warfare, you must first prove them and know how to use them.  So before you can fight spiritually, you must prove prayer and faith in God.