It is permissible here to refer the name earth to the Church, as in the psalm: "You established the earth upon its firm foundations; it shall not be shaken unto ages of ages" (Ps 103:5). "Upon firm foundations" means upon the saints, by whose prayers and labors of teaching and spreading salvation the enemy's manifest deceits are destroyed. Yet it would be better to understand the earth as human nature in Christ. For He is the truth that sprang from the earth (Ps 84:12), and He always appears before the face of God, according to the Apostle's word: "He appeared for us" (Heb 9:24). For it is said that this earth, having swallowed the death which it took into itself, opened its mouth, as it were, so that, as we know, it might swallow the prince of death by the abundance of its life. Nevertheless the devil was swallowed when Christ, sitting on the mountain and opening His mouth, gave His disciples the great commandment, abolishing the law of commandments by His teaching (Eph 2:15).