To appease the perturbations of the mind, to live a tranquil, upright, unremorseful life, to cultivate the power of governing by the will the current of our thoughts, repressing unruly passions, exaggerated anxieties, and unhealthy desires, is at least one great recipe for banishing from our pillows those painful dreams that contribute not a little to the unhappiness of many lives. An analogous branch of self-culture is that which seeks to provide some healthy aliment for the waking hours of the night, when time seems so unnaturally prolonged, and when gloomy thoughts and exaggerated and distempered views of the trials of life peculiarly prevail. Among the ways in which education may conduce to the real happiness of man, its power of supplying pleasant or soothing thoughts for those dreary hours is not the least, though it is seldom or never noticed in books or speeches. It is, perhaps, in this respect that the early habit of committing poetry--and especially religious poetry--to memory is most important. In estimating the value of those intermissions of labour which are not spent in active enjoyment one other consideration may be noted. There are times when the mind should lie fallow, and all who have lived the intellectual life with profit have perceived that it is often in those times that it most regains the elasticity it may have lost and becomes most prolific in spontaneous thought. Many periods of life which might at first sight appear to be merely unused time are, in truth, among the most really valuable.