For God is not gracious and merciful to sinners to the end that they might not keep his Law, nor that they should remain as they were before they received grace and mercy; but he condones and forgives both sin and death for the sake of Christ, who has fulfilled the whole Law in order thereby to make the heart sweet and through the Holy Spirit to kindle and move the heart to begin to love from day to day more and more.
Martin LutherIf then, Moses so distinctly announces that there is in us not only a faculty, but also a facility for keeping all commandments, why are we sweating so much? ... What need is there now of Christ or of Spirit? We have found a passage that asserts freedom of choice, but also distinctly teaches that the keeping of the commandments is easy.
Martin LutherReason must be deluded, blinded, and destroyed. Faith must trample underfoot all reason, sense, and understanding, and whatever it sees must be put out of sight and ... know nothing but the word of God.
Martin Luther