The plain argument for the existence of the Deity, obvious to all, and carrying irresistible conviction with it, is the evident contrivance and fitness of things for each other which we meet with throughout all parts of the universe. There is no need of subtile reasonings in this matter. A manifest contrivance immediately suggests a contriver. It strikes us like a sensation, and artful reasonings against it may puzzle us, but they do not shake our belief. No person who knows the principles of optics and the structure of the eye believes that it was formed without a knowledge of that science, or that the ear was formed without a knowledge of sounds, or that male and female in animals were not formed for each other and for continuing the species. All accounts of nature are full of instances of this kind. The admirable and beautiful structure of things for final causes exalts our idea of the contriver, and the unity of design shows him to be one. The great motions in the systems, performed with the same facility as the least, suggests his almighty power, which gave motion to the earth and the celestial bodies with equal ease as to the minutest particles. The subtility of the motions and actions in the internal parts of bodies shows that his influence penetrates the inmost recesses of things, and that he is equally active and present every-where. The simplicity of the laws that prevail in the world, and the excellent disposition of things in order to obtain the best ends, and the beauty which adorns the works of nature, far surpassing any thing in art, suggests his consummate wisdom. The usefulness of the whole scheme, so well contrived for the intelligent beings who enjoy it, with the internal dispositions and moral structure of those beings themselves, shows his unbounded goodness. These are arguments which are sufficiently open to the views and capacities of the unlearned, while at the same time they acquire new strength and luster from the discoveries of the learned. The existence of God is the basis of religion. This truth will be evident if we remember that the word religion always denotes either a system of truths of which God is the great subject, or a system of affections and conduct of which he is the supreme object. Were there no such being, there could be no such relations and duties. Were the existence of such being incapable of proof, the existence of the relations and duties would be equally incapable of being proved. But God has not left himself without ample witness.