It is just as if you had before you two works by one author, who had, in the first place, written a book for children; and then, in the second place, had prepared a volume of more profound instruction for persons of riper years and higher culture. At times, when you found obscure and difficult passages in the work meant for the more advanced scholars, you would refer to the little book which was intended for the younger folk, and you would say, "We know that this means so-and-so, because that is how the matter is explained in the book for beginners." So creation, providence, and history are all books which God has written for those to read who have eyes, written for those who have ears to hear his voice in them, written even for carnal men to read, that they may see something of God therein. But the other glorious Book is written for you who are taught of God, and made spiritual and holy. Oftentimes, by turning to the primer, you will get something out of that simple narrative which will elucidate and illustrate the more difficult classic, for that is what the Word of God is to you. There is a certain type of thought which God has followed in all things. What he made with his Word has a similarity to the Word itself by which he made it; and the visible is the symbol of the invisible, because the same thought of God runs through it all. There is a touch of the divine finger in all that God has made; so that the things which are apparent to our senses have certain resemblances to the things which do not appear. That which can be seen, and tasted, and touched, and handled is meant to be to us the outward and visible sign of a something which we find in the Word of God, and in our spiritual experience, which is the inward and the spiritual grace; so that there is nothing forced and unnatural in bringing nature to illustrate grace; it was ordained of God for that very purpose. Range over the whole of creation for your similes; do not confine yourself to any particular branch of natural history. The congregation of one very learned doctor complained that he gave them spiders continuously by way of illustration. It would be better to give the people a spider or two occasionally, and then to vary the instruction by stories, and anecdotes, and similes, and metaphors drawn from geology, astronomy, botany, or any of the other sciences which will help to shed a side-light upon the Scriptures.