Everyone who has fallen away from divine love is ruled through sensual pleasure by the carnal law. With such a law, he cannot keep a single divine commandment, nor does he wish to: preferring a life of pleasure to a life ruled by virtue and lived in the Spirit of God, he embraces ignorance instead of knowledge.
To treat one’s neighbor as oneself is to be concerned simply with his existence. This pertains to the natural law. To love one’s neighbor as oneself is to care, in a way that accords with virtue, for his well-being. This is prescribed by the written law (Leviticus 19:18 & Mark 12:33). To love one’s neighbor more than oneself is a prerogative of the law of grace.
~St Maximos the Confessor