Rebellious emotions rob Christians of godly thinking, causing us to enter into cycles of wrong feelings. Our feelings could all be in the flesh if they are not derived from the Word of God.
For the river to part to let Israel into the Promised Land, the priests had to put their feet in the water while there was a flood going on. Furthermore, they had to stand there until every Israelite had "passed clean over" the Jordan into Canaan. It happened because of their walk. The priests stepped on the head of the devil and crushed his rebellion, which could infect their emotions. "Thou madest [man] to have dominion over the works of thy hands; thou hast put all things under his feet" (Psalm 8:6).
The Father gave all things to the Son, who is the head of the Church, and put all things under His feet. Who has His feet? The Body of Christ. Where is everything today? Everything is under our feet. So with every step we take with God, we crush Satan's purpose, frustrate his plan, and embarrass a supernatural being.
What does Satan do when we do this? He flees. "Submit yourselves therefore to God. Resist the devil, and he will flee from you" (James 4:7).