He finished, at this time, or revised his school treatises, which he had begun at Milan, comprising all the liberal arts--grammar, dialectic, rhetoric, geometry, arithmetic, philosophy, music. Of all these books he only finished the first, the treatise on grammar. The others were only summaries, and are now lost. On the other hand, we have still the six books on music, likewise begun at Milan, which he finished, almost as an amusement, at Thagaste. They are dialogues between himself and his pupil, the poet Licentius, upon metre and scansion. But we know from himself that he intended to make this book longer, and to write a second part upon melody, that is to say, music, properly so called. He never found the time: "Once," he says, "the burthen of ecclesiastical affairs was placed on my shoulders, _all these pleasant things_ slipped from my hands." Thus, the monk Augustin only rests from prayer and meditation to study music and poetry. He has thought it necessary to excuse himself. "In all that," says he, "I had but one purpose. For, as I did not wish to pluck away too suddenly either young men, or those of another age, on whom God had bestowed good wits, from ideas of the senses and carnal literature, _things it is very hard for them not to be attached to_, I have tried by reasoning lessons to turn them little by little, and by the love of unchanging truth, to attach them to God, sole master of all things.... He who reads these books will see that if I have touched upon the poets and grammarians, 'twas more by the exigency of the journey than by any desire to settle among them.... Such is the life I have chosen to walk with the feeble, not being very strong myself, rather than to hurl myself out on the void with wings still half-fledged...."