One or two plain lessons may be drawn from these words. There is an "if," then. However great the powers of Christ and of His work, however deep the desire and fixed the purpose of God, no fulfilment of these is possible except on condition of our habitual exercise of faith. The Gospel does not work on men by magic. Mind, heart and will must be exercised on Christ, or all His power to purify and bless will be of no avail to us. We shall be like Gideon's fleece, dry when the dew is falling thick, unless we are continually putting forth living faith. That attracts the blessing and fits the soul to receive it. There is nothing mystical about the matter. Common sense tells us, that if a man never thinks about any truth, that truth will do him no good in any way. If it does not find its road into his heart through his mind, and thence into his life, it is all one as if there were no such truth, or as if he did not believe it. If our creed is made up of truths which we do not think about, we may just as well have no creed. If we do not bring ourselves into contact with the motives which the Gospel brings to bear on character, the motives will not mould our character. If we do not, by faith and meditation, realize the principles which flow from the truth as it is in Jesus, and obtain the strength which is stored in Him, we shall not grow by Him or like Him. No matter how mighty be the renewing powers of the Gospel wielded by the Divine Spirit, they can only work on the nature that is brought into contact with and continues in contact with them by faith. The measure in which we trust Jesus Christ will be the measure in which He helps us. "He could do no mighty works because of their unbelief." He cannot do what He can do, if we thwart Him by our want of faith. God will present us holy before Him _if_ we continue in the faith. And it must be present faith which leads to present results. We cannot make an arrangement by which we exercise faith wholesale once for all, and secure a delivery of its blessings in small quantities for a while after, as a buyer may do with goods. The moment's act of faith will bring the moment's blessings; but to-morrow will have to get its own grace by its own faith. We cannot lay up a stock for the future. There must be present drinking for present thirst; we cannot lay in a reserve of the water of life, as a camel can drink at a draught enough for a long desert march. The Rock follows us all through the wilderness, but we have to fill our pitchers day by day. Many Christians seem to think that they can live on past acts of faith. No wonder that their Christian character is stunted, and their growth stopped, and many a blemish visible, and many a "blame" to be brought against them. Nothing but continual exercise of faith, day by day, moment by moment, in every duty, and every temptation, will secure the continual entrance into our weakness of the strength which makes strong and the purity which makes pure.