The truth is that the family, like marriage, is one of those institutions whose very importance renders them complex. Abstract ideas are the only simple ones, because they have little to do with life. The family is not the arbitrary creation of a legislator; it is a natural consequence of the division of the species into two sexes, of the human child's protracted helplessness, of maternal love which ministers to this helplessness, of paternal love which is far more artificial and recent in human history, and composed just as much of love for the mother as of that for the child.

Un Art de Vivre (The Art of Living) (1939) - The Art of Family Life