Through his father's lectures, Christian came under the influence of the political philosophy of Hugo Grotius and Samuel Pufendorf, and continued the study of law at the University of Frankfurt (Oder)[1] in 1675, completing his doctorate in 1679.
In 1680, he married Anna Christine Heyland and started a legal practice in Leipzig; the following year he began teaching at the university’s law school as well.
Though not a profound philosophical thinker, Thomasius prepared the way for great reforms in philosophy, as well as in law, literature, social life and theology.
It was his mission to introduce a rational, common-sense point of view, and to bring the divine and human sciences to bear on the everyday world.
Thomasius is often spoken of in German works as the author of the "territorial system," or Erastian theory of ecclesiastical government; but he taught that the state may interfere with legal or public duties only, and not with moral or private ones.