See how God has protected Heaven from mankind and to their advantage !

But in these matters a convincing argument, may be drawn from this creation which has been arranged by a wise Creator, for, because he knew that mankind (would) presume with their Freewill and attempt by their free Choice to set a limit to creation . . . because they are not able to set a limit to creation—for Constraint does not permit them—they have attempted to set a limit to the Creator by Disputation; just as also they wished to build a Tower by which they might go up whither an ascent should not be made. [Gen. viii.] [P. 36, l.22.] For the ladder to that Height is the grace of the Creator, nor in thousands or myriads of years would they be able to go up to that Height whither Elijah went up in the twinkling of an eye. For a tower does not enable (us) to ascend to Heaven, because it is the Will of the Lord of the Heaven that enables (us) to ascend to Heaven. Therefore, in order that kings at the present time might not be bold like those of old He placed them in the midst of a creation which cannot be overcome. For (should they wish) to go up above, there are the outstretched heights immeasurable,—to go down beneath, there are the terrible impalpable depths,—to cross the ends (of the earth), [P. 37.] there are bitter illimitable seas, and these [things He did, not because He was afraid on His own account—He who is not capable of being injured—but He made the heaven strong against our boldness that it may not wear itself out in vain and fruitless efforts]. [L. 11.] [The Realm of the Good Being ought to have been protected likewise.] And if the creation is so protected against weak mankind it would be much more right that the Domain of the Good (Being) who actually exists should be fortified against terrible enemies. For as the Lord of the Domain is perfect in his Essence, so it is right also that his Domain be fashioned aright, and his building fortified, and it would be right that that building; should be protected with a strong wall. [lxvii]