Logically and historically the Biblical idea stands related to a number of other ideas. Attempts have been made to find a definition of so general a nature as to comprehend them all. The older theologians assumed the Christian standpoint, and put into their definitions the conclusions of Christian doctrine and philosophy. Thus, Melanchthon: "God is a spiritual essence, intelligent, eternal, true, good, pure, just, merciful, most free and of infinite power and wisdom." Thomasius more briefly defines God as "the absolute personality." These definitions take no account of the existence of lower religions and ideas of God, nor do they convey much of the concreteness and nearness of God revealed in Christ. A similar recent definition, put forward, however, avowedly of the Christian conception, is that of Professor W. N. Clarke: "God is the personal Spirit, perfectly good, who in holy love creates, sustains and orders all" (Outline of Christian Theology, 66). The rise of comparative religion has shown that "while all religions involve a conscious relation to a being called God, the Divine Being is in different religions conceived in the most different ways; as one and as many, as natural and as spiritual, as like to and manifested in almost every object in the heavens above or earth beneath, in mountains and trees, in animals and men; or, on the contrary, as being incapable of being represented by any finite image whatsoever; and, again, as the God of a family, of a nation, or of humanity" (E. Caird, Evolution of Religion, I, 62). Attempts have therefore been made to find a new kind of definition, such as would include under one category all the ideas of God possessed by the human race. A typical instance of this kind of definition is that of Professor W. Adams Brown: "A god in the religious sense is an unseen being, real or supposed, to whom an individual or a social group is united by voluntary ties of reverence and service" (Christian Theology in Outline, 30). Many similar definitions are given: "A supersensible being or beings" (Lotze, Asia Minor Fairbairn); "a higher power" (Allan Menzies); "spiritual beings" (E.B. Tylor); "a power not ourselves making for righteousness" (Matthew Arnold). This class of definition suffers from a twofold defect. It says too much to include the ideas of the lower religions, and too little to suggest those of the higher. It is not all gods that are "unseen" or "supersensible," or "making for righteousness," but all these qualities may be shared by other beings than gods, and they do not connote that which is essential in the higher ideas of God. Dr. E. Caird, looking for a definition in a germinative principle of the genesis of religion, defines God "as the unity which is presupposed in the difference of the self and not-self, and within which they act and re-act on each other" (op. cit., I, 40, 64). This principle admittedly finds its full realization only in the highest religion, and it may be doubted whether it does justice to the transcendent personality and the love of God as revealed in Jesus Christ. In the lower religions it appears only in fragmentary forms, and it can only be detected in them at all after it has been revealed in the absolute religion. Although this definition may be neither adequate nor true, its method recognizes that there can be only one true idea and definition of God, and yet that all other ideas are more or less true elements of it and approximations to it. The Biblical idea does not stand alone like an island in mid-ocean, but is rather the center of light which radiates out in other religions with varying degrees of purity.