Sec. IV. Moreover, if there be any intermissions in philosophy, and yet your later studies are firmer and more continuous than your former ones, it is no bad indication that your sloth has been expelled by labour and exercise; for the contrary is a bad sign, when after a short time your lapses from zeal become many and continuous, as if your zeal were dying away. For as in the growth of a reed, which shoots up from the ground finely and beautifully to an even and continuous height, though at first from its great intervals it is hindered and baffled in its growth, and afterwards through its weakness is discouraged by any breath of air, and though strengthened by many and frequent joints, yet a violent wind gives it commotion and trembling, so those who at first make great launches out into philosophy, and afterwards find that they are continually hindered and baffled, and cannot perceive that they make any progress, finally get tired of it and cry off. "But he who is as it were winged,"[258] is by his simplicity borne along to his end, and by his zeal and energy cuts through impediments to his progress, as merely obstacles on the road. As it is a sign of the growth of violent love, not so much to rejoice in the presence of the loved one, for everyone does that, as to be distressed and grieved at his absence,[259] so many feel a liking for philosophy and seem to take a wonderful interest in the study, but if they are diverted by other matters and business their passion evaporates and they take it very easily. "But whoever is strongly smitten with love for his darling"[260] will show his mildness and agreeableness in the presence of and joint pursuit of wisdom with the loved one, but if he is drawn away from him and is not in his company you will see him in a stew and ill at ease and peevish whether at work or leisure, and unreasonably forgetful of his friends, and wholly impelled by his passion for philosophy. For we ought not to rejoice at discourses only when we hear them, as people like perfumes only when they smell them, and not to seek or care about them in their absence, but in the same condition as people who are hungry and thirsty are in if torn away from food and drink, we ought to follow after true proficiency in philosophy, whether marriage, or wealth, or friendship, or military service, strike in and produce a separation. For just as more is to be got from philosophy, so much the more does what we fail to obtain trouble us.