In his treatise _De Legibus_, which was written two years later than the _De Republica_, when he was fifty-five, and shortly after the murder of Clodius, he represents himself as explaining to his brother Quintus and Atticus, in their walks through the woods of Arpinum, the nature and origin of the laws and their actual state, both in other countries and in Rome. The first part only of the subject is contained in the books now extant; the introduction to which we have had occasion to notice, when speaking of his Stoical sentiments on questions connected with State policy. Law he pronounces to be the perfection of reason, the eternal mind, the divine energy, which, while it pervades and unites in one the whole universe, associates gods and men by the more intimate resemblance of reason and virtue, and still more closely men with men, by the participation of common faculties, affections, and situations. He then proves, at length, that justice is not merely created by civil institutions, from the power of conscience, the imperfections of human law, the moral sense, and the disinterestedness of virtue. He next proceeds to unfold the principles, first, of religious law, under the heads of divine worship; the observance of festivals and games; the office of priests, augurs, and heralds; the punishment of sacrilege and purjury; the consecration of land, and the rights of sepulchre; and, secondly, of civil law, which gives him an opportunity of noticing the respective duties of magistrates and citizens. In these discussions, though professedly speaking of the abstract question, he does not hesitate to anticipate the subject of the lost books, by frequent allusions to the history and customs of his own country. It must be added, that in no part of his writings do worse instances occur, than in this treatise, of that vanity which was notoriously his weakness, which are rendered doubly offensive by their being put into the mouth of his brother and Atticus.[218]