"Looking unto the promise of God, he wavered not through unbelief, being fully assured that what He had promised He was able also to perform." Rom. 4: 20, 21.
Abraham did not doubt. Glorious testimony to provoke us to jealousy, and thus to the imitation of his example. Therefore the word also gives us to know what the power was in virtue of which he obtained faith and brought all doubt to silence. The secret lay simply in the conviction: What God has promised, He is able also to perform. On this account he was assured, and whenever reflections and doubtings would arise, he always held before his eyes the incontrovertible argument: That which has been promised, God is able to perform. Hence it is that there stands written: "Without being weakened in faith, he considered his own body now as good as dead before Him whom he believed, even God, who quickeneth the dead and calleth the things that are not as though they were." (Rom. 4: 19, 17, RV.) To every question, "How can these things be?" there was his simple answer: "What God has promised He is able also to perform. For the Lord there is nothing too wonderful. It is not my business to be anxious, and to say how God's word can be fulfilled. The Lord will see to it."
My reader, you mourn over the power of your doubts, and say that you cannot overcome them: come, learn of Abraham how you can do this. The first thing that is necessary is that you understand and reflect what promise the Lord has given you. If the Lord has given no promises for you, then it cannot be your duty to believe. But, as surely as the word says "Believe," is there also a promise which you must believe. To take only one out of the thousands which are in the Scriptures, "The Son of Man is come to seek and to save that which was lost." God gives you the gracious promise, and commands you to believe it with all your heart. It is His will that you should receive it as the truth that His Son has come for all that are lost, hence also for you. He desires that you should believe that His Son seeks you and longs for you, and that His Son will save you.
God wills that you should ponder this thought and cherish it in your heart, until your whole soul takes its stand on this truth: Jesus seeks me, lost as I am; there is grace for me. As soon as you believe that, the Savior begins to come in to you.
If now you have reached this first point, if you know that there is a promise also for you, then the second duty is not to look into yourselves to know if there is hope that what you expect will take place. As Abraham did not regard his own body, which was already dead, so must you not regard your own dead soul. Although you feel yourself to be dead, powerless, insincere, very sinful, although you are lacking in penitence, earnestness, and in all else that you know you ought to have, still act like Abraham: believe on God, who maketh the dead alive, and calleth the things that are not as though they were. Act like Abraham, and cast down every doubt with the thought: "What God has promised He is able also to perform." Keep your mind occupied with this certain truth: He is come to save that which was lost, and there is no lost one so far lost that Jesus cannot find him and cannot save him.
Once again, it comes simply to these two points: know if there is a promise for you, lost sinner; if so, then cleave simply to this fact: What has been promised He is able also to perform. "Lord, I believe; help thou mine unbelief. I will no longer dishonor Thee by doubtings: Thy power, Thy love, Thy faithfulness, I will adore and trust. I will venture to surrender my soul to Thee. Although I feel it not, I will believe it. Thou seekest and savest that which is lost. Lord, help: I do believe."