At a later period in Greek history, the philosophers, including Plato and Aristotle, continued to attribute to music power so great, that we can only understand them if we bear in mind that with the Greeks the word music was a comprehensive term for all the arts presided over by the Muses, and that, even when music in our sense is alluded to by them, the reference is at the same time to the poetry which was almost always associated with music, and made its meaning and expression more definite. Thus, we can realize how Terpander could, by the power of his song, reconcile the political factions in Sparta, and how Plato could write, in the "Republic," that "any musical innovation is full of danger to the state and ought to be prevented." He looked upon music as a tonic which does for the mind what gymnastics do for the body; and taught that only such music ought to be tolerated by the state as had a moral purpose, while enervating forms should be suppressed by the law makers. Yet, after making due allowance for the fact that the word music was used in this comprehensive sense, enough remains to show that the power of music proper, the power of rhythmic melody, was profoundly appreciated by the Greeks. If they had not felt how greatly music intensifies and quickens the emotions, they would not have wedded all their poetry to it, nor have resorted to it on all solemn and festive occasions; nor would the Pythagoreans have found anyone willing to believe in their doctrine that music has power to control the passions. "They firmly believed," says Naumann, "that sweet harmony and flowing melody alone were capable of restoring the even balance of the disturbed mind, and of renewing its harmonious relations with the world. Playing on the lyre, therefore, formed part of the daily exercises of the disciples of the renowned philosopher, and none dared seek his nightly couch without having first refreshed his soul at the fount of music, nor return to the duties of the day without having braced his energies with jubilant strains. Pythagoras is said to have recommended the use of special melodies as antidotal to special passions, and indeed, it is related of him that on a certain occasion he, by a solemn air, brought back to reason a youth who, maddened by love and jealousy, was about setting fire to the house of his mistress."