The well-balanced conviction of Lemaître, developed in many of his writings, was that neither science nor religion should attempt to speak of things in areas in which neither has any competence. Religion, according to Lemaître, should concern itself with our soul and with salvation, leaving to science the understanding of nature. He was convinced that it was foolish to defend the idea that whoever wrote Genesis had even the slightest understanding of cosmology. Genesis knows nothing about physics, and physics knows nothing about God.