A living Saviour in the present, who works with us, confirming the word with signs following, is the source of our power. Not till He is impotent shall we be weak. The unmeasurable measure of the gift of Christ defines the degree, and the unending duration of His life who continueth for ever sets the period, of our possession of the grace which is given to every one of us. He is ever bestowing. He never withdraws what He once gives. The fountain sinks not a hairs-breadth, though nineteen centuries have drawn from it. Modern astronomy begins to believe that the sun itself by long expense of light will be shorn of its beams and wander darkling in space, circled no more by its daughter planets. But this Sun of our souls rays out for ever the energies of life and light and love, and after all communication possesses the infinite fulness of them all. 'His name shall be continued as long as the sun; all nations shall call Him blessed.' Here then, brethren, are the perpetual elements of our constant power, an eternal Word, an abiding Spirit, an unchanging Lord. II. The condition of exercising this power is Faith. With such a force at our command--a force that could shake the mountains and break the rocks--how come we ever to fail? So the disciples asked, and Christ's answer cuts to the very heart of the matter. Why could you not cast him out? For one reason only, because you had lost your hold of My strength, and therefore had lost your confidence in your own derived power, or had forgotten that it was derived, and essayed to wield it as if it were your own. You did not trust Me, so you did not believe that you could cast him out; or you believed that you could by your own might, therefore you failed. He throws them back decisively on themselves as solely responsible. Nowhere else, in heaven or in earth or hell, but only in us, does the reason lie for our breakdown, if we have broken down. Not in God, who is ever with us, ready to make all grace abound in us, whose will is that all men should be saved and come to the knowledge of the truth; not in the gospel which we preach, for 'it is the power of God unto salvation'; not in the demon might which has overcome us, for 'greater is He that is in us than he that is in the world.' We are driven from all other explanations to the bitterest and yet the most hopeful of all, that we only are to blame.