" A stronghold is an area of sin that has become part of our lifestyle. It may be a harmful habit (drugs, fornication, smoking), or it may be an attitude (rejection, loneliness, worry, doubt). We use a whole arsenal of rationalizations and speculations to support these habits or attitudes. But the knowledge on which these strongholds are based directly opposes God’s truth (2 Cor. 10:5). "

― Charles F. Stanley , Handle with Prayer: Unwrap the Source of God's Strength for Living