According to the popular instinct, then, which on a subject of this kind appears the safest of all guides, a religion involves first a belief and next a public practice. The nature of the belief is in these days wholly peculiar to religion; in other times it was not so, because then people believed other things much in the same way. But in these days the test of religious belief is that it should make men accept as certain truth what they would disbelieve on any other authority. For example, a true Roman Catholic believes that the consecrated host is the body of Christ, and so long as he lives in the purely religious spirit he continues to believe this; but so soon as the power of his religious sentiment declines he ceases to believe it, and the wafer appears to him a wafer, and no more. And so amongst Protestants the truly religious believe many things which no person not being under the authority of religion could by any effort bring himself to believe. It is easy, for example, to believe that Joshua arrested the sun's apparent motion, so long as the religious authority of the Bible remains perfectly intact; but no sooner does the reader become critical than the miracle is disbelieved. In all ages, and in all countries, religions have narrated marvellous things, and the people have always affirmed that not to believe these narratives constituted the absence of religion, or what they called atheism. They have equally, in all ages and countries, held the public act of participation in religious worship to be an essential part of what they called religion. They do not admit the sufficiency of secret prayer.