Albert Einstein's religious views have been widely studied and often misunderstood. Albert Einstein stated that he believed in the pantheistic God of Baruch Spinoza. He did not believe in a personal God who concerns himself with fates and actions of human beings, a view which he described as naïve. He clarified however that, "I am not an atheist", preferring to call himself an agnostic, or a "religious nonbeliever." Einstein also stated he did not believe in life after death, adding "one life is enough for me." He was closely involved in his lifetime with several humanist groups.