For a like reason Catholics often refuse to kiss the Protestant Bible in court. They prefer simply _to affirm_. And in this they are perfectly right, although to attest one's willingness to tell the truth on such occasions is not supposed to be a trial of one's faith, and hence it does not involve anything of a denial of Catholic truth. But I must pass on to one or two illustrations to show in what fields the Bible is _not_ to be used. For though it furnishes most apt means for imparting a knowledge and inciting to the further study of history, languages, the principles of government and ethics, together with the development of a graceful and withal vigorous style of English writing, yet there are limits to its use in some directions. Thus the Bible cannot be considered as replacing the exact sciences. We are quite safe always in affirming that the Bible never contradicts science; that where it does not incidentally confirm the results of scientific research it abstracts from the teaching of science. Its language relating to physical facts is popular, not scientific. There is no reason to think that the inspired writers received any communication from heaven as to the inward workings of nature. They had simply the knowledge of their age, and described things accordingly. Leo XIII. in his recent Encyclical on the study of the Sacred Scriptures strongly reiterates this doctrine, advanced by many Doctors of the Church, namely, that the _sacred writers_ had no intention of initiating us into the secrets of nature or to teach us the inward constitution of the visible world. Hence their language about "the firmament," and how "the sun stood still," as we still say "the sun rises."[8]