Panaetius' mission was carried on by another Rhodian philosopher, the famous Posidonius, who lived long enough to know Cicero himself and many of his contemporaries; a man less inspiring perhaps than Panaetius, but of greater knowledge and attainment; a traveller, geographer, and a man of the world, whose writings on many subjects, though lost to us, really lie at the back of a great part of the Roman literary output of his time.[173] He was the disciple of Panaetius; envoy from Rhodes to Rome in the terrible year 86; and later on the inmate of Roman families, and the admired friend of Cicero Pompeius, and Varro. Philosophy was only one of the many pursuits of this extraordinary man, whose literary and historical influence can be traced in almost every leading Roman author for a century at least; but his philosophical importance was during his lifetime perhaps predominant. The generation that knew him was rich in Stoics; for example, Aelius Stilo, the master of Varro, "doctissimus eorum temporum," as Gellius calls him;[2] Rutilius, who was mentioned just now as having written memoirs; and among others probably the great lawyer Mucius Scaevola. Cato, as we have seen, was not a follower of the Roman school of Stoicism, but of the older and uncompromising doctrine; but Cicero, though never a professed Stoic, was really deeply influenced, and towards the end of his life almost fascinated, by a creed which suited his humanity while it stimulated his instinct for righteousness.[174] And, like Cicero, many other men of serious character felt the power of Stoicism almost unconsciously, without openly professing it.