Swami Vivekananda on Universalism
By the study of different religions we find that in essence they are one. When I was a boy, this skepticism reached me, and it seemed for a time as if I must give up all hope of religion. But fortunately for me I studied the Christian religion, the Mohammedan, the Buddhistic, and others, and what was my surprise to find that the same foundation principles taught by my religion were also taught by all religions… We see, therefore, that if one religion is true, all others must be true. There are differences in non-essentials, but in essentials they are all one.