The law, it is agreed on all hands--that is, the revelation, whether written or unwritten--was deposited with the apostles, then it was deposited, as we have seen, with the church identical with the apostolic body. Now, she knows, as the apostles knew, what she received, the law committed to her charge, and, as she is constituted by the law she has received, she knows, and cannot but know, her own constitution and powers, also what promises, if any, she has received from her divine Lawgiver and Founder. The promises of God cannot fail; and if he has promised her his assistance as an immunity from error she knows it, and knows that her judgments of law, or in matters of faith, are through that assistance infallible. Of all these questions she is the divinely constituted judge. She is the judge of the law constituting her, of her own appointment and commission, and of her rights, powers, and jurisdiction, no less than of the law or revelation committed to her charge, for all this is included in the law. If she defines that in her commission is included the promise of the divine assistance to protect her from error in interpreting and declaring the law--that is, the faith, the revealed word of God--then of all this she judges infallibly, and she is the infallible authority, not for believing what God has revealed--for that is believed on the veracity of God alone--but for believing that what she teaches as his revealed word is his revealed word, and therefore the law we are to obey in thought, word, deed, as the supreme court is the authority for defining its own constitution and powers, and what is or is not the law of the state. Say we not, then, truly that the church is her own witness and accredits herself? Say we not truly, also, that she is the faithful and infallible witness to the fact of revelation, and teacher and judge of what God has or has not revealed? The fact, then, that the church defines that she is the divinely appointed guardian and infallible teacher and judge of revelation, is all we need to know in order to know that it is God we believe in believing her.