Jesus said to him, “I am the way, and the truth, and the life. No one comes to the Father except through me.”John 14:6
What does it mean to come to the Father? It means nothing else but to come from death to life, from sin and condemnation to innocence and godliness, from distress and sorrow to eternal joy and blessedness. Christ is saying, “No one should try to come to the Father through a different way than through Me. I alone am the way, the truth, and the life.” Christ clearly rules out and powerfully disproves all teaching that salvation can be obtained by works. He completely denies that we can get to heaven by any other way. For Jesus says, “No one comes to the Father except through me.” There is no other way. …
Though everyone else may abandon me and leave me lying in ruins, I will still have an eternal treasure that can never fail me. This treasure isn’t the result of my own works or efforts. The treasure is Christ—the way, the truth, and the life. Only through Christ do I come to the Father. I will hold to this, live by this, die by it.
Martin Luther, His Passion, 94.