Martin Bucer, Wolfgang Capito, John Oecolampadius, and Guillaume Farel were also influential figures in the development of Reformed theology. These reformers came from diverse academic backgrounds, but later distinctives of Reformed theology can already be detected in their thought, especially the priority of scripture as a source of authority. Scripture was also viewed as a unified whole, which led to a covenantal view of the sacraments of baptism and the Lord's Supper as visible signs of the covenant of grace. Another Reformed distinctive present in these theologians was their denial of the bodily presence of Christ in the Lord's supper. Each of these theologians also understood salvation to be by grace alone, and affirmed a doctrine of particular election (the teaching that some people are chosen by God for salvation). Martin Luther and his successor Philipp Melanchthon were undoubtedly significant influences on these theologians, and to a larger extent later Reformed theologians. The doctrine of justification by faith alone was a direct inheritance from Luther.