Many are familiar with the story concerning the Greek god Achilles, whose mother dipped him in the river Styx to achieve his invulnerableness to fatal weapons. Because she held him by one of his heels while dipping him in the river, this part of his body, not covered by the protective fluid, was his only vulnerable point.
This story, of course, remains in the category of a myth. But the real man, made in God's perfect image and likeness, is completely surrounded by God's loving presence and governed by His infinite power. He is not a mortal, vulnerable to attacks of error.
The Bible substantiates this fact concerning man in the opening chapter of Genesis, declaring that man is, always has been, and eternally will be God's image, including all that could issue from a wholly good source or creator. Evil could never find a foothold in this perfect likeness of God. There is no Achilles' heel, no weak point, no vulnerable spot, no flaw or defective part in this spiritual, perfect man. God and His reflection, man and the universe, are the all of reality. Therefore there is no space in which the aggressive suggestions of the carnal mind could work destruction or cause discord of any kind.