And while it is true that such content can only be ascertained by work, it is not true that the work is a specially difficult one. The Revelation of God's mind made through Holy Scripture and through the life of His Incarnate Son is an open book that any one can study; and to any objection that such study has led chiefly to difference of opinion and darkness rather than light, the answer is that such disaster follows for the most part only when the guidance of the Catholic Church is repudiated; when, that is, we pursue a course in this study which we should not pursue in relation to any other. If we were studying geology we should not regard it as the best course to scorn all that preceding students have done, and betake our unprepared selves to field work! But that is the "Bible and the Bible only" theory of spiritual knowledge. If we want to know the meaning of the Biblical teaching, we must make use of the helps which the experience of the Church has richly provided. But the nature of the divine will and the particulars of our obligation are not merely, perhaps one ought to say, not chiefly, to be assimilated through our brains. The best preparation for the doing of the will of God and the progressive entering into His mind, is an obedient life. Purity of character will carry us farther on this path than cleverness of brains. Our Lord's own rule is: _He that doeth the will shall know of the doctrine._ In other words, we understand the mind of God and attain to the illumination of the conscience, through sympathetic response to the will so far as we have seen it. And each new response, in its turn, carries us to a deeper and clearer understanding of the will. That is to say, our conscience, by habitual response to God's will, so far as it knows it, is so illumined as to be able to make trustworthy judgments on new material submitted to it.