How did Lessing argue for religious toleration?

Gotthold Ephraim Lessing advocated for religious toleration primarily through his dramatic work Nathan the Wise (1779), which serves as a profound plea for humanity over dogmatic division.12

Central to his argument is the parable of the ring. In the story, a father possesses a ring that makes its wearer beloved by God and men, but he has three sons he loves equally. To avoid favoritism, he creates two identical copies. The parable suggests that Judaism, Christianity, and Islam are like these three brothers; rather than bickering over which religion is "true," followers should prove the validity of their faith through ethical conduct and love for mankind.1

Lessing argued that the search for truth is more valuable than the certainty of rigid orthodoxy. He believed that all religions share a common ethical basis and that humanity should transcend prejudice and dogma to achieve universal brotherhood. By portraying a wise Jewish protagonist who embodies the ideal of humanity, Lessing also challenged the antisemitic stereotypes prevalent in his time.21