During the six months that he was at Athens he renewed an early acquaintance with one who was destined to become the most faithful, and certainly the best known, of his friends. This was Titus Pomponius, known to the world as that Atticus to whom were addressed something more than half the large body of letters which were written by Cicero, and which have remained for our use.[48] He seems to have lived much with Atticus, who was occupied with similar studies, though with altogether different results. Atticus applied himself to the practices of the Epicurean school, and did in truth become "Epicuri de grege porcus." To enjoy life, to amass a fortune, to keep himself free from all turmoils of war or state, to make the best of the times, whether they were bad or good, without any attempt on his part to mend them--this was the philosophy of Titus Pomponius, who was called Atticus because Athens, full of art and literature, easy, unenergetic, and luxurious, was dear to him. To this philosophy, or rather to this theory of life, Cicero was altogether opposed. He studied in all the schools--among the Platonists, the Stoics, even with the Epicureans enough to know their dogmas so that he might criticise them--proclaiming himself to belong to the new Academy, or younger school of Platonists, but in truth drawing no system of morals or rule of life from any of them. To him, and also to Atticus, no doubt, these pursuits afforded an intellectual pastime. Atticus found himself able to justify to himself the bent of his disposition by the name of a philosopher, and therefore became an Epicurean. Cicero could in no way justify to himself any deviation from the energy of public life, from its utility, from its ambition, from its loves, or from its hatred; and from the Greek philosophers whom he named of this or the other school, received only some assistance in that handling of so-called philosophy which became the chief amusement of his future life. This was well understood by the Latin authors who wrote of Cicero after his own time. Quintilian, speaking of Cicero and Brutus as writers of philosophy, says of the latter, "Suffecit ponderi rerum; scias enim sentire quæ dicit."[49]--"He was equal to the weight of the subject, for you feel that he believes what he writes." He leaves the inference, of course, that Cicero wrote on such matters only for the exercise of his ingenuity, as a school-boy writes.