1310. About hereditary and actual evil
It is quite well known that the evils of parents pass over into children and grandchildren, both that we are born evil and from the seed derive an evil nature, and that the disposition of the parents is visible in the descendants. This is obvious from many characteristics, such as love of self, love of the world, love of earthly things, lust. Thus those acquired through actual practice by parents, even from the first, pass over [into descendants], if they are not reformed.