“If you want to be safe and out of danger to your conscience and your salvation, put a check on this speculative spirit.
Take hold of God as Scripture instructs you (1 Cor. 1:21, 24): “Since, in wisdom, the world did not know God through wisdom, it pleased God through the folly of what we preach to save those who believe. We preach Christ crucified, a stumbling block to Jews and folly to Gentiles, but to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God.”
Therefore begin where Christ began—in the Virgin’s womb, in the manger, and at His mother’s breasts. For this purpose He came down, was born, lived among men, suffered, was crucified, and died, so that in every possible way He might present Himself to our sight. He wanted us to fix the gaze of our hearts upon Himself and thus to prevent us from clambering into heaven and speculating about the Divine Majesty.
Therefore whenever you consider the doctrine of justification and wonder how or where or in what condition to find a God who justifies or accepts sinners, then you must know that there is no other God than this Man Jesus Christ.
Take hold of Him; cling to Him with all your heart, and spurn all speculation about the Divine Majesty; for whoever investigates the majesty of God will be consumed by His glory. I know from experience what I am talking about.
But these fanatics, who deal with God apart from this Man, will not believe me. Christ Himself says: “I am the Way, and the Truth, and the Life; no one comes to the Father, but by Me” (John 14:6).
Outside Christ, the Way, therefore, you will find no other way to the Father; you will find only wandering, not truth, but hypocrisy and lies, not life, but eternal death.
Take note, therefore, in the doctrine of justification or grace that when we all must struggle with the Law, sin, death, and the devil, we must look at no other God than this incarnate and human God.”
–Martin Luther, Luther’s Works, Vol. 26: Lectures on Galatians, 1535, Chapters 1-4 (ed. Jaroslav Jan Pelikan, Hilton C. Oswald, and Helmut T. Lehmann; vol. 26; Saint Louis: Concordia Publishing House, 1999), 26: 29.