Jesus also, that he might sanctify the people with his own blood, suffered outside the gate. Therefore, let us go forth to him outside the camp, bearing his reproach. For we have no continuing city here, but we seek one to come.
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"The light of the body is the eye; therefore, when thine eye is single,
thy whole body also is full of light.
But when thine eye is evil, thy body also is full of darkness."
Jesus, in Luke 11:34
The opposite of single is not double, according to Jesus' parable here. Rather the opposite of single is "evil".
Anything other than a completely made-up mind leaves room for darkness to enter. So, anything other than single-mindedness toward God is evil.