Luke 1:45

“And blessed is she that believed..... Meaning Mary, a woman, a very young woman, and who had had things very incredible to nature and reason told her; and yet she believed, without objecting thereto, or requiring a sign; tacitly referring to the unbelief of Zacharias, who was a man, a man in years, a priest by office; and yet had been very incredulous, in a thing that was much more possible; because there had been instances of it before, in Sarah, Hannah, and Manoah's wife; than what was related to the virgin, of which there had been none; and which to reason, and with men, was impossible: and happy indeed is every one, that has true faith in any degree; for faith is the faith of God's elect, and is both a fruit and evidence of electing grace, which is the source of all blessings; it is the gift of God, and the operation of his Spirit, and can never be lost: many are the blessings such as believe are in the possession of, and openly entitled to; as the justification of their persons, the remission of their sins, their adoption into the household of God, liberty at the throne of grace, and a right to the eternal inheritance; they enjoy much solid peace, joy, and comfort in their own souls; bring much glory to God, and shall be saved in the Lord, with an everlasting salvation: for there shall be a performance of those things which were told her from the Lord: these words may be considered, either as the subject matter of her faith, and be rendered in connection with the former, thus, "blessed is she that believed, that there shall be a performance, &c", being fully persuaded, that what the angel had told her, concerning the conception and birth of a son, concerning his name, and the greatness of his person, and the nature, extent, and duration of his kingdom, should be certainly and punctually fulfilled; or as a reason of her happiness, because there should be a sure accomplishment of them. Whatever God has spoken to any of his people, whether it be with respect to things temporal, spiritual, or eternal, shall be performed; as may be strongly concluded from the veracity of God, who cannot lie; and from his power, who is able to do all things; and from his faithfulness, which he will never suffer to fail; and from instances, and matters of fact; from the experience of the saints in all ages, who know, and are conscious to themselves, that not one of the good things the Lord God has spoken to them, has ever failed, but that all have come to pass; see Jos 23:14.”

“Blessed is she that believed; for there shall be, etc. - Or, Blessed is she who hath believed that there shall be, etc. This I believe to be the proper arrangement of the passage, and is thus noticed in the marginal reading. Faith is here represented as the foundation of true happiness, because it receives the fulfillment of God's promises. Whatever God has promised, he intends to perform. We should believe whatever he has spoken - his own authority is a sufficient reason why we should believe. Let us only be convinced that God has given the promise, and then implicit faith becomes an indispensable duty: in this case not to believe implicitly would be absurd and unreasonable - God will perform his promise, for He cannot lie.”