God is whole hearted and wants us to be the same - not half-hearted or double-minded. He wants us to trust in Him and be fully committed to Him. While we are on the fence, in a place of indecision, we're not safe. This is seen in Joab's revenge on Abner, when he lured him into the gates of Hebron (2Sam 3:27). The gates of a city represent the place of decision, where you are neither in or out. Hebron was a city of refuge (a picture of Christ) and Abner was safe while inside the city (trusting in Christ), but when Joab (the enemy) persuaded him to meet with him in the gates (the place of indecision), he was unsafe, and the enemy was able to destroy him. This is why David said that Abner died the death of a fool. Likewise, when we remain in two minds about whether we should respond to Christ or trust in His Word or whether to obey God or not, we are 'in the gate', which is not a safe place. We are vulnerable to the enemy. God wants us to get off the fence!