He also denied the doctrine of original sin and asserted that baptism should be for adults only.

He was poorly advised in sending this book to the Reformer, with whom he had some correspondence.

With Calvin's knowledge and probably at his instigation, though he later issued an equivocating denial, William Trie, of Geneva, denounced Servetus to the Catholic inquisition at Vienne and forwarded the material sent by the heretic to Calvin.

On June 17, 1553, the Catholic inquisitor, expressly stating that he acted on this material, condemned Servetus to be burnt by slow fire, but he escaped and went to Geneva.
Here he was recognized and arrested.

Calvin at once appeared as his prosecutor for heresy.