But he did not foresee what was to come, both to himself or others. His two books of a devotional character were, one on 'The Gift of Prayer,' a formal and elaborate treatise with many divisions and subdivisions, in spirit earnest and devout. Its companion treatise, 'Ecclesiastes; or the Gift of Preaching,' shows a high conception of the learning which he thought necessary for one who would preach well; knowledge of commentators; of preachers, especially of English sermon-writers; of works on Christian doctrine, on the history of Christianity; of all subjects which can be included in Theology. The list of books recommended is enormous, and beyond the reach of any man--even of Wilkins or Casaubon: it must have been intended to be a work of reference, a catalogue from which a student might select. It, like his 'Sermons Preached on Several Occasions,' is illumined by quaint utterances, humorous, sensible, and devout; qualities more frequently combined in those days than in our own, when the "dignity of the pulpit," a lamentable superstition, has weakened its influence, and has made religion appear to simple people remote from common life. Wilkins' most original and valuable contribution to Theology is 'The Principles and Duties of Natural Religion,' written in his later years, and published after his death by Tillotson. Mr Sanders, the writer of the too short article on Wilkins in the 'Dictionary of National Biography,' says that "in this work there are thoughts which anticipate the argument of Butler's 'Analogy.'" Wilkins, like Butler and Newman, draws distinctions between different kinds of evidence and different degrees of consequent assent. He points out that neither Natural Religion nor Christianity can be proved true by demonstration like a conclusion in geometry, or in any kind of mathematical reasoning; that in default of this inference from self-evident premises to propositions of equal cogency, we must, in a matter of paramount practical importance, be content to judge, as fairly and soberly as we can, by that "probability" which Butler calls "the guide of life." Wilkins perceived, what few in his time perceived, that there are no "demonstrations" of Christianity, nor even of Theism; that faith is faith. Further, he emphasises the harmony between Natural and Revealed Religion, the fact that one is the complement of the other. But in him there are not the depth, candour, and seriousness of Butler, nor that sense of mystery which makes him the weightiest of Christian Apologists in the estimation both of disciples and opponents.