If, however, each in his own way thus set forth a peculiar creed of nature, we must ever bear in mind that the popular religion, with its poetical imagery, and the fabulous mythology of antiquity, as affording not only no sufficient, but absolutely no answer to the inquiring mind, as to the essence of things, and the first cause of all, could not possibly satisfy these earlier thinkers. Consequently, they might well feel tempted to find, each for himself, a way to honor nature, and to contemplate the supreme Being. Since then, however, the world has grown older by nearly twenty-five centuries, and much, in the mean while, has been accomplished by, or fallen to the share of, the human race. But when philosophy would pretend to regard this long succession of ages, and all its fruits, as suddenly erased from the records of existence, and for the sake of change would start afresh, so perilous an experiment can scarcely lead to any good result, but in all probability, and to judge from past experience, will only give rise to numberless and interminable disputes. Such an open space in thought--cleared from all the traces of an earlier existence (a smoothly-polished marble tablet, as it were, like the _tabula rasa_ of a recent ephemeral philosophy)--would only serve as an arena for the useless though daring ventures of unprofitable speculation, and could never form a safe basis for solid thought, or for any permanent manifestation of intellectual life. In itself it is nothing surprising if young and inexperienced minds, occupying themselves prematurely, or in a perverted sense, with the grand ideas of God and Nature, liberty and the march of thought, should be wholly overmastered and carried away with them. It has often happened before now, and it is no new thing if youthful and ardent temperaments should either yield to the seductive temptation to make, not to say create, a new religion of their own; or else feel a deceitful impulse to censure and to change all that is already in existence, and, if possible, to reform the whole world by their newly-acquired ideas.