2 Chronicles 20:17 Ye shall not need to fight in this battle: set yourselves, stand ye still, and see the salvation of the Lord with you, O Judah and Jerusalem: fear not, nor be dismayed, tomorrow go out against them: for the Lord will be with you.
The Word of God was spoken in prophecy with a promise to Jehoshaphat before facing battle with a great enemy: “You do nothing; just stand still and watch. The Lord will be with you and He fights for you. So fear not.” This would take a strong faith on Jehoshaphat’s part, for man’s natural response is to do something. But he had the faith to believe God. He stood still and watched God’s salvation. And the Lord gave a decisive victory without the army participating.
It’s not natural to believe that Jesus did everything necessary to gain the victory and earn salvation for us. All we do is watch: we hear the Gospel. That’s all. The Holy Spirit plants the faith in the heart so that we may receive what Christ has done. We hear the Gospel. By faith we see the cross. And we are saved. Stand still!