Just as Satan and his invisible forces of wickedness find human personnel on earth to carry out their evil purposes, so Christ and His invisible heavenly hosts solicit human believers to enlist in His holy purposes for redeeming, renewing, and reaching the world with His Gospel and preparing a people for eternity.
Both Moses and Joshua learned about God’s invisible armies. Before Moses could lead the Israelites out of Egyptian bondage and before Joshua could lead them into the Promised Land, they learned of these supernatural forces without which they could never have succeeded.