Truth, though eternal, is never stationary; nor will the law of progress ever reach a standpoint. There is always something to be done, some vacuum to be filled. It is said by philosophers that Nature abhors a vacuum. I do not doubt it, especially if it be a vacuum in the human head. It is pretty certain that the youthful head, if not filled with sense at the proper time, will soon be filled with nonsense. Neither errors of the head nor errors of the heart can be easily eradicated, when once implanted. The moral nature of the child may be moulded at will; but the cherished opinions of age can seldom, if ever, be either reversed or essentially modified. In the great battle of life our success as individuals must depend on the kind of armor in which we are clad, and the kind of weapons with which we are supplied. For effective service there is nothing which can be brought into the field so formidable or so irresistible as the artillery of logic. Intellect is always sure of becoming the ultimate victor. We read of giants in the chronicles of the early ages,—physical giants, who could overthrow the pillars of the proudest temples, and bear off mountains upon their shoulders; yet of what value to the world were their marvellous exploits, if really true, compared with the achievements of those intellectual giants who have appeared at different epochs, and taught mankind the most useful lessons in the arts, in the sciences, and in philosophy? And here let me say to the young aspirant for worldly honors that if he would achieve high aims, he must not only aim high, but have faith in himself as well as in a Divine Providence. Indeed, every man, however humble, may become great in his vocation, if he will; yet no man can become truly great who is not truly good.

So far as human perfection can be defined, it consists in the purity and sublimity of moral action,—a perfection which may be approached, if not reached, by all who are so disposed. How truly has it been said that we are never too old or too wise to learn! Nor is any man so ignorant but he may teach a philosopher something.

No matter how conservative we may be in our creeds and opinions, the world will continue to move onward; nor can it stand still if it would. The time is at hand when errors in creed, as well as in education, to which we cling, will not only be exposed, but exploded. However hopeless the condition of the masses may seem, they are already demanding more light and only await an opportunity to proclaim their emancipation from mental thraldom.

The statistics relating to the numbers of mankind, and to the frail tenure of human life, convey lessons which ought not to be disregarded in the estimate we make of what man can do to elevate himself. Strange as it may seem, it is a fact pretty well ascertained that the entire population of the globe neither increases nor diminishes, but remains essentially the same. And yet the population of the earth is continually undergoing changes from the operation of local causes, increasing here and diminishing there, as the ages advance. The law involved seems based on the principle of a just compensation for all diminution. In other words, the earth has a limited capacity, and like a cup when filled, can hold no more, yet always remains full.

When we consider the fact that one fourth of mankind die before reaching seven years of age; one half before reaching seventeen years; and that sixty persons die every minute,—we are struck with astonishment, and are naturally led to inquire into the reasons. The causes which abridge life may for the most part be attributed to popular ignorance, or disregard of physical law,—either in ancestor, parent, or child. Nothing can be truer than the fact that the "sins of the fathers are visited upon their children unto the third and fourth generation," and even to indefinite generations. It is indeed a fearful inheritance, when life comes to us tainted with constitutional disease. For this there seems to be no remedy, except in the adoption of such a popular system of education as will diffuse a practical knowledge of the laws of health.

It may be safely asserted that many people, especially in America, where food is abundant and the style of living luxurious, "dig their own graves with their teeth." Americans, as we all know, are disposed to live fast, and of course die prematurely. In short, we are a sanguine, impatient people; have morbid appetites, crave rich viands, seek wealth and office, and care for little else. In our successes we commit excesses. In the pure elixir of life we infuse drops of poison. Yet Nature proffers us the gift of long life, and waits our acceptance with a patient spirit. Though extreme longevity may not be desirable, yet many more than now do, might attain to the dignity of centenarians, if they would but live in obedience to physical law.

In the elements of his physical nature, man is truly "of the earth earthy." Chemists say that a man of ordinary size is composed of forty pounds solid matter and five buckets of water, all of which may be converted into gas. However this may be, man is a delicate piece of mechanism, a combination of divine inventions. For example, his eye is a telescope, which penetrates the mysteries of the stars; his ear is a drum, which repeats every sound in nature; his heart a timepiece, which marks, with measured beat, the fleeting moments of his life; his vocal organs a harp with a thousand strings, which is capable of uttering the divinest music.

And yet man in his moral nature, though created but "a little lower than the angels," is a profound puzzle. He advances many theories, questions even divine truth, yet believes in absurdities. Nor need we marvel at this, perhaps, when we recall the fact that mankind speak more than three thousand different languages, and profess more than one thousand different religions.