51Commandment Ninth. Prayer Must Be Made to God Without Ceasing, and with Unwavering Confidence. 52Commandment Tenth. Of Grief, and Not Grieving the Spirit of God Which is in Us. 54Commandment Eleventh. The Spirit and Prophets to Be Tried by Their Works; Also of the Two Kinds of Spirit. 57Commandment Twelfth. On the Twofold Desire. The Commandments of God Can Be Kept, and Believers Ought Not to Fear the Devil. 61Book Third.—Similitudes 62Similitude First. As in This World We Have No Abiding City, We Ought to Seek One to Come. 64Similitude Second. As the Vine is Supported by the Elm, So is the Rich Man Helped by the Prayer of the Poor. 66Similitude Third. As in Winter Green Trees Cannot Be Distinguished from Withered, So in This World Neither Can the Just from the Unjust. 67Similitude Fourth. As in Summer Living Trees are Distinguished from Withered by Fruit and Living Leaves, So in the World to Come the Just Differ from the Unjust in Happiness. 68Similitude Fifth. Of True Fasting and Its Reward: Also of Purity of Body. 74Similitude Sixth. Of the Two Classes of Voluptuous Men, and of Their Death, Falling Away, and the Duration of Their Punishment. 78Similitude Seventh. They Who Repent Must Bring Forth Fruits Worthy of Repentance. 80Similitude Eighth. The Sins of the Elect and of the Penitent are of Many Kinds, But All Will Be Rewarded According to the Measure of Their Repentance and Good Works. 88Similitude Ninth. The Great Mysteries in the Building of the Militant and Triumphant Church. 109Similitude Tenth. Concerning Repentance and Alms-Giving. 112Elucidations 116TATIAN 117Introductory Note 121Address to the Greeks 122Chapter I. The Greeks Claim, Without Reason, the Invention of the Arts. 123Chapter II. The Vices and Errors of the Philosophers. iii