In conclusion, I remark that the conception of any other than an infinite God--a God unlimited in all perfections--is not only a self-contradictory but an unworthy conception; it not only perplexes the intellect but revolts the spiritual affections. The heart can find no secure rest except on an infinite God. If less than omnipotent, He may be unable to help us in the hour of sorest need. If less than omniscient, He may overlook us. If less than perfectly just, we cannot unreservedly trust Him. If less than perfectly benevolent, we cannot fully love Him. The whole soul can only be devoted to One who is believed to be absolutely good. LECTURE X. MERE THEISM INSUFFICIENT. I. I have endeavoured to show, in the course of lectures which I am now bringing to a close, that the light of nature and the works of creation and providence prove the existence, and so far manifest the goodness, wisdom, and power of God. This truth ought always to be combined with another--namely, that the light of nature and the works of creation and providence "are not sufficient to give that knowledge of God, and of His will, which is necessary unto salvation." Reason sends forth a true light which is to be trusted and followed so far as it extends, but which is much more limited than the wants of human nature. The deepest discoveries and the highest achievements of the unaided intellect need to be supplemented by truths which can only come to us through special revelation. The natural knowledge of God which man can attain by the exercise of his own faculties is not sufficient to make him feel that the Eternal bears to him fatherly love, or to break the power of sin within him and over him, or to sustain and develop his moral and spiritual life. It falls far short of what is required to enable a human soul, a religious and immortal being, to accomplish its true destination. It falls far short, in other words, of being what is "necessary unto salvation," in the broad and comprehensive sense which the term salvation bears throughout Scripture. There are those who, instead of regarding theism as simply so much fundamental truth which Christianity presupposes and applies, would oppose theism to Christianity, and substitute theism for Christianity. They would rest in mere theism and would reject Christianity. They represent theism, dissociated from Christianity, as all-sufficient, and as the religion to which alone the future belongs. In doing so, these men--many of them most earnest and excellent men--seem to me to show great want of reflection, great ignorance of the teachings of history, and a very superficial acquaintance with human nature.