[Sidenote: Religion Means to be Practically True. God is a Disposition from which Consequences May Rationally be Expected.] § 30. The difficulty of reaching a definite statement in this matter is due to the fact that the truth in which any religious experience centres is a practical and not a scientific truth. A practical truth does not commit itself to any single scientific statement, and can often survive the overthrow of that scientific statement in which at any given time it has found expression. In other words, an indefinite number of scientific truths are compatible with a single practical truth. An instance of this is the consistency with my expectation of the alternation of day and night, of either the Ptolemaic or Copernican formulation of the solar system. Now expectation that the sun will rise to-morrow is an excellent analogue of my religious belief. Celestial mechanics is as relevant to the one as metaphysics to the other. Neither is overthrown until a central practical judgment is discredited, and either could remain true through a very considerable alteration of logical definition; but neither is on this account exempt from theoretical responsibility. In so far as religion deliberately enters the field of science, and defines its formularies with the historical or metaphysical method, this difficulty does not, of course, exist. Grant that the years of Methuselah's life, or the precise place and manner of the temptation of Jesus, or the definition of Christ in the terms of the Athanasian Creed, are constitutive of Christianity, and the survival of that religion will be determined by the solution of ordinary problems of historical or metaphysical research. But the Christian will very properly claim that his religion is only externally and accidentally related to such propositions, since they are never or very rarely intended in his experience. As religious he is occupied with Christ as his saviour or with God as his protector and judge. The history of Jesus or the metaphysics of God essentially concern him only in so far as they may or may not invalidate this relationship. He cares only for the power and disposition of the divine, and these are affected by history and metaphysics only in so far as he has definitely put them to such proof.