28. There is therefore not only a close intercourse between what is virtuous and what is useful, but the same thing is both useful and virtuous. Therefore He Who willed to open the kingdom of heaven to all sought not what was useful to Himself, but what was useful for all. Thus we must have a certain order and proceed step by step from habitual or common acts to those which are more excellent, so as to show by many examples the advancement of what is useful.