The article is the revised version of a valedictory lecture given at the University of Lucerne on 21 May 2015. The focus is on religious worldviews. First (1), instead of giving a definition by genus and difference I circumscribe religious worldviews with a set of three characteristics. Then (2), I defend the thesis that religious worldviews have to be reasonable in order to be good. This reasonableness is specified by three criteria: (2.a) A good religious worldview has to be good not only for me, but also for others insofar as a good worldview does not allow one to kill other people, to make them ill or to discriminate against them because of an accidental human characteristic, such as race, gender, disability or sexual orientation. (2.b) A good religious worldview must allow freedom of faith, conscience and creed. (2.c) A good religious worldview must accept the corroborated results of the natural sciences and the humanities. Finally (3), I emphasize in which way a good religious worldview is good not only for others, but also for me.