(A comment on Sacred Fictions, in The Storytelling Animal).
I suppose this reflection (together we stand, divided we fall) may apply at many levels. At the the level of world civilization, in which fanatical nationalisms and religions are a dangerous element of confrontation. And at the level of the individual, who may also be a house divided against himself when the same person is intellectually, socially or emotionally committed to different or even contrary ideological systems.
L'homme ne poursuit que des chimères.
Man follows only phantoms.
The last words of Pierre-Simon de Laplace, according to Augustus De Morgan.