Again, if we consider the structure of a single plant, or of a single animal, we find that every one of the members and parts of which it is composed has its peculiar function or purpose in the economy of the whole plant or the whole animal. Let one of these component parts refuse its function or cease to fulfil its purpose and the whole is disorganised. Certainly there must be a Being who makes the different members of an organism co-operate for the development and advantage of the whole. The idea of purpose which regulates this co-operation cannot have originated in the parts nor in the whole, but in the conception of Him by whose Will these were created. “The finger of God” is further recognised in the important events of the life of the individual as well as in the history of whole nations. We are frequently reminded of the lesson, “The heart of man deviseth his way, but the Lord directeth his step” (Prov. xvi. 9). “Salvation is the Lord’s, and on Thy people it is incumbent to bless Thee” (Ps. iii. 9). Another argument in support of the belief in the existence of God is taken from the moral consciousness which every human being possesses. This points to the existence of a higher Being, perfect in goodness, as the origin and cause of the moral consciousness in our own heart. These and similar arguments are employed to strengthen and purify our belief in God. The question, however, arises, are these arguments alone sufficient to convince us? Are they strong enough to resist the attacks of scepticism? On examining them thoroughly we shall find them of excellent service to the believer. His belief is strengthened against many doubts by which he may be assailed; and scepticism will be kept at bay by these arguments. But of themselves and unsupported they may not always suffice to establish belief in God; and if they carry conviction with them for the moment, we are not sure whether fresh arguments of opponents might not again unsettle the mind. Another method was therefore chosen by the Almighty, by which certainty is attained, and a sure guide is given for our moral and religious life. It is Revelation. Of this we shall speak later on. The principal forms of religion or worship that sprang from the natural belief in God are Polytheism, Pantheism, Atheism, Theism, and Deism. 1. The first form of Divine worship of which history and archæology give us information is Polytheism. The creating and ruling power of some invisible Being was noticed everywhere. Every manifestation of such influence was ascribed to its peculiar deity, which was worshipped according to the peculiar conception of the deity in the mind of the individual person, family, or nation. This is chiefly the kind of idolatry mentioned in the Bible and combated by the prophets.