In regard to the present question, while it explains what our duty is it teaches that the power of obeying it is derived from the goodness of God, and it accordingly urges us to pray that this power may be given us. If there were merely a command and no promise, it would be necessary to try whether our strength were sufficient to fulfil the command; but since promises are annexed, which proclaim not only that aid, but that our whole power is derived from divine grace, they at the same time abundantly testify that we are not only unequal to the observance of the Law, but mere fools in regard to
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