The presence of God is like a beacon in our life, it's like the wall of fire that protected the children of Isreal from the wrath of the Egyptians.
Saul last the spirit and presence of God, when he disobeyed the word of God, and when the presence left him he became like a normal human.
We must not allow sin and disobedience to make the presence of God leave, without it were exposed to the enemy.