Stoicism was far more congenial to the national character, and many great men professed it. Besides Laelius, who was a disciple of Diodes and Panactius, we have the names of Rutilius Rufus, Aelius Stilo, Balbus, and Scaevola. But during the tumultuous activity of these years it was not possible for men to cultivate philosophy with deep appreciation. Political struggles occupied their minds, and it was in their moments of relaxation only that the questions agitated by stoicism would he discussed. We must remember that as yet stoicism was one of several competing systems. Peripateticism and the Academy, as has been said, attracted the more sceptical or argumentative minds, for their dialectics were far superior to those of stoicism; it was in its moral grandeur that stoicism towered not only above these but above all other systems that have been invented, and the time for the full recognition of this moral grandeur had not yet come. At present men were occupied in discussing its logical quibbles and paradoxes, and in balancing its claims to cogency against those of its rivals. It was not until the significance of its central doctrine was tried to the uttermost by the dark tyranny of the Empire, that stoicism stood erect and alone as the sole representative of all that was good and great. Still, the fact that its chief professors were men of weight in the state, lent it a certain authority, and Cicero, among the few definite doctrines that he accepts, numbers that of stoicism that virtue is sufficient for happiness.