On the contrary, when a man has got to the end of one art or course of study, he is compelled to consider what he shall do next. And, when we have gone through a cycle of as many acquisitions, as, from the limitation of human faculties, are not destructive of each other, we shall find ourselves frequently reduced to the beginning some of them over again. Nor is this the least agreeable occupation of human leisure. The book that I read when I was a boy, presents quite a new face to me as I advance in the vale of years. The same words and phrases suggest to me a new train of ideas. And it is no mean pleasure that I derive from the singular sensation of finding the same author and the same book, old and yet not old, presenting to me cherished and inestimable recollections, and at the same time communicating mines of wealth, the shaft of which was till now unexplored. The result then of these various observations is to persuade the candid and ingenuous man, to consider life as an important and ample possession, to resolve that it shall be administered with as much judgment and deliberation as a person of true philanthropy and wisdom would administer a splendid income, and upon no occasion so much to think upon the point of in how short a time an interesting pursuit is to be accomplished, as by what means it shall be accomplished in a consummate and masterly style. Let us hear no more, from those who have to a considerable degree the command of their hours, the querulous and pitiful complaint that they have no time to do what they ought to do and would wish to do; but let them feel that they have a gigantic store of minutes and hours and days and months, abundantly sufficient to enable them to effect what it is especially worthy of a noble mind to perform! ESSAY VIII. OF HUMAN VEGETATION. There is another point of view from which we may look at the subject of time as it is concerned with the business of human life, that will lead us to conclusions of a very different sort from those which are set down in the preceding Essay. Man has two states of existence in a striking degree distinguished from each other: the state in which he is found during his waking hours; and the state in which he is during sleep.