 It was in Burgsteinfurt that his "De praedestinatione" (Burgsteinfurt, 1597), "De sancta Trinitate" (1597), and "De persona et officio Christi" (1597) brought on him a suspicion of Socinianism; but in 1599 he successfully defended his orthodoxy before the theological faculty of Heidelberg.He was promoted in Burgsteinfurt, in 1605 receiving the additional appointments of preacher and assessor to the consistory.After the death of Arminius, he accepted, in 1610, a call to Leiden.