Two books yet remain to be written by me, in order to complete, by God's help, what I promised. One of these will explain the punishment of the wicked, the other the happiness of the righteous; and in them I shall be at special pains to refute, by God's grace, the arguments by which some unhappy creatures seem to themselves to undermine the divine promises and threatenings, and to ridicule as empty words statements which are the most salutary nutriment of faith. But they who are instructed in divine things hold the truth and omnipotence of God to be the strongest arguments in favour of those things which, however incredible they seem to men, are yet contained in the Scriptures, whose truth has already in many ways been proved; for they are sure that God can in no wise lie, and that He can do what is impossible to the unbelieving.