Philip Melanchthon was a German reformer, collaborator with Martin Luther, the first systematic theologian of the Protestant Reformation, intellectual leader of the Lutheran Reformation, and an influential designer of educational systems. He stands next to Luther and Calvin as a reformer, theologian, and molder of Protestantism. Along with Luther, he is the primary founder of Lutheranism. They both denounced what they believed was the exaggerated cult of the saints and asserted justification by faith. Melanchthon made the distinction between law and gospel the central formula for Lutheran evangelical insight. By the "law", he meant God's requirements both in Old and New Testament; the "gospel" meant the free gift of grace through faith in Jesus Christ.