Reader, will you carelessly refuse to take the time and to go to the trouble and expense of getting and reading earnestly _two books_ that _may_ lead you to the truth? Oh, reader, outstrip the heathen queen in search of light. Give your life-time, if need be, to an earnest investigation of this matter. Picture two men, one giving his life-time to earnest, honest, searching for the truth concerning sin and salvation through Christ; the other, from indifference, or pride, or prejudice, or love of the world, or secret sin, never making an earnest, honest investigation; the one dying and going to Heaven; the other dying and going to Hell. Which shall it be in your case, reader? There is absolutely no uncertainty as to the result _if only_ you will be honest, and earnest and persevering in your search for the truth. Listen to Jesus: John 7:17, "If any man _willeth_ to do his will, he _shall know_ of the teaching, whether it is of God, or whether I speak from myself." Whether you, reader, are ignorant or learned cuts absolutely no figure in this case. Jesus throws the assurance open to _any man_. The one condition is if he "_willeth to do his will_." No man wills to do God's will who will not go to the extreme of earnest, honest, prayerful investigation. If you do, then the veracity, the very character, of Jesus is at stake. Consider, then, reader, the awful responsibility that rests upon you, if you do not give attention to a thorough, earnest, honest, prayerful investigation for the truth. Another promise of equal certainty comes from the Old Testament: Hosea 6:3, "Then shall we know if we follow on to know the Lord." Many make a slight search and cease. The promise is not to them, but to those who persevere. If we use the light as we receive it, and follow it up, _we shall know_. Again certainty is promised. Does not God, because He is God, deserve such earnest consideration from you, reader? Have you any right to expect anything from Him if you approach Him in a half-hearted, indifferent way? The following cases in point may encourage the reader: Two learned men decided to prove that the Bible was not from God, and that Jesus Christ was not the Saviour; but they were in earnest and they were honest. They had vast libraries at their service. They gave months to investigation. They were both convinced and accepted the Saviour and wrote their books in defence of the Bible, instead of against it. Second, one of the greatest scholars of Europe, probably the greatest, stated in a public lecture in America, that, of the thirty leading sceptics of the nineteenth century, men who had written brilliant books in their young manhood against the Bible, he knew twenty-eight in their old age, and that every one of the twenty-eight, after mature investigation, had accepted the Lord Jesus as Saviour.