 Religion will not regain its old power until it can face change in the same spirit as does science. Its principles may be eternal, but the expression of those principles requires continual development. This evolution of religion is in the main a disengagement of its own proper ideas in terms of the imaginative picture of the world entertained in previous ages. Such a release from the bonds of imperfect science is all to the good. (1925 [1967: 188–189])