And yet not so either. The happiest and most valuable thoughts of the human mind will sometimes come when they are least sought for, and we least anticipated any such thing. In reading a romance, in witnessing a performance at a theatre, in our idlest and most sportive moods, a vein in the soil of intellect will sometimes unexpectedly be broken up, "richer than all the tribe" of contemporaneous thoughts, that shall raise him to whom it occurs, to a rank among his species altogether different from any thing he had looked for. Newton was led to the doctrine of gravitation by the fall of an apple, as he indolently reclined under the tree on which it grew. "A verse may find him, who a sermon flies." Polemon, when intoxicated, entered the school of Xenocrates, and was so struck with the energy displayed by the master, and the thoughts he delivered, that from that moment he renounced the life of dissipation he had previously led, and applied himself entirely to the study of philosophy. --But these instances are comparatively of rare occurrence, and do not require to be taken into the account. It is still true therefore for the most part, that not more than eight hours in the day are passed by the wisest and most energetic, with a mind attentive and on the alert. The remainder is a period of vegetation only. In the mean time we have all of us undoubtedly to a certain degree the power of enlarging the extent of the period of transcendant life in each day of our healthful existence, and causing it to encroach upon the period either of mental indolence or of sleep.--With the greater part of the human species the whole of their lives while awake, with the exception of a few brief and insulated intervals, is spent in a passive state of the intellectual powers. Thoughts come and go, as chance, or some undefined power in nature may direct, uninterfered with by the sovereign will, the steersman of the mind. And often the understanding appears to be a blank, upon which if any impressions are then made, they are like figures drawn in the sand which the next tide obliterates, or are even lighter and more evanescent than this.