The first dated writings of Paracelsus are theological treatises on Mary, the Trinity, church criticism and scriptural interpretation. They were written in Salzburg in 1524/25. Paracelsus defended the purity and eternity of Mary and saw her as a goddess. The writing De genealogia Christi fulfilled the promise of metaphysical explanations. An anticlerical polemic written on the eve of the Peasants War meant a turn towards the Radical Reformation. Following the example of the church reformation, Paracelsus attempted in 1527 in Basel a reform of medieval medicine with experience in the first place.