God created the intellect as a blessing to man. Many a time this intellect stands as an obstacle between man and the life of surrender!
This happens when the intellect works alone detached from the illumination of the Holy Spirit and detached from humility by which the intellect stoops down, submitting to God's will. Someone touched his head, saying: "This is Adam's apple". He means that his mind is the cause of all his falls and trials. The mind is not the only thing which stands against the will of God when convinced with other matters that disagree with His order or when it puts God's orders in the crucible of investigation and analysis. There is also the passion which may desire things forbidden by the Lord and therefore it may stand against the will of God.