Mark 3:24-25 

If a kingdom is divided (split into factions and rebelling) against itself, that kingdom cannot stand. And if a house is divided against itself, that house cannot stand.

When our spirits and souls agree, we are in the faith. If we are in doubt in our minds and not letting our spirit lead us, we are divided. We must decide to follow and concentrate in faith on the word. We will only stand and conquer when soul and spirit are in agreement.