§ 10. (1.) Be convinced that heaven is the only treasure and happiness, and labor to know what a treasure and happiness it is. If thou do not believe it to be the chief good, thou wilt never set thy heart upon it; and this conviction must sink into thy affections; for if it be only a notion, it will have little efficacy. If Eve once supposes she sees more worth in the forbidden fruit, than in the love and enjoyment of God, no wonder if it have more of her heart than God. If your judgment once prefers the delights of the flesh, before the delights in the presence of God, it is impossible your heart should be in heaven. As it is ignorance of the emptiness of things below, that makes men so over-value them; so it is ignorance of the high delights above, which is the cause that men so little mind them. If you see a purse of gold, and believe it to be but counters, it will not entice your affections to it. It is not the real excellence of a thing itself, but its known excellence, that excites desire. If an ignorant man see a book, containing the secrets of arts or sciences, he values it no more than a common piece, because he knows not what is in it; but he that knows it, highly values it, and can even forbear his meat, drink, and sleep to read it. As the Jews killed the Messiah, while they waited for him, because they did not know him; so the world cries out for rest, and busily seeks for delight and happiness, because they know it not; for did they thoroughly know what it is, they could not so slight the everlasting treasure.