Observe how Paul puts this great matter. He was the greatest _doctrinal_ writer of the New Testament; but he does not say that he believes in _doctrines_, but that he believes in a _Person_. "I know _whom_ I have believed." All doctrinal belief follows, and is comprised in, that. Faith everywhere in Scripture is confidence in Christ. He who believes in Christ must come sooner or later to believe in the doctrines which cluster around Him. But our experience grows beyond these into the realisation of Him as being so actual, so near, and so sufficient, as to be our true rest. Who among us can tell _all_ the reasons why he believes in Christ? Many of them cannot be put into words. They belong to our most secret thoughts, to the emotions of our happiest hours, to a hidden, silent history, which, if the world heard, it could not understand. Yet these proofs multiply in proportion as the Christian advances in life. How many times have we found the words of Christ adapted to our wants! How many unexpected deliverances has He wrought on our behalf! How many answers to prayer have we received at His hands! How much peace has He breathed into our hearts! "I know whom I have believed, and am persuaded that He is able to keep that which I have committed unto Him against that day." What a grand confirmation have we here of the faith Paul preached! Had his trust been misplaced, surely he had suffered enough to disabuse him of it, and that most completely. But his faith grows the more he suffers. No mere party zeal could stand a test like this; no, nor any delusion either. And so we say that such a man as Paul was, under the circumstances in which he maintained his trust, could not be deceived. Thus Paul's faith becomes a confirmation of our own, and, with him on our side, we may face a world of doubt. But I wish to use the text chiefly for the elucidation of a single subject. Paul's words express _the assurance of his faith_. How does this subject strike us? Does not the very mention of it give rise to sad reflections in many hearts? "The assurance of faith." "Ah, I knew it once," we say; "it was the experience of earlier days, and has been the experience of some special days since then, still more so of some specially holy moments. But it is not my normal state. Would it were!"