In the Sermon on the Mount, Jesus explained the second Commandment: "You have heard that it was said to the men of old, 'You shall not swear falsely, but shall perform to the Lord what you have sworn.' But I say to you, Do not swear at all.... Let what you say be simply 'Yes' or 'No'; anything more than this Comes from the Evil one." 82 Jesus teaches that every oath involves a reference to God and that God's Presence and his Truth must be honored in all speech. Discretion in calling upon God is allied with a Respectful awareness of his presence, which all our assertions either Witness to or mock.