For Badiou there is no “principle of sufficiency” of philosophy, except when it is replaced by its philosophemes. Philosophy is not sufficient, it does not produce or constitute its truths. Philosophy is conditioned, it seizes on or apprehends its truths from outside.
Appropriate to re-up this on the topic of Badiou:https://speculativeheresy.wordpress.com/2010/03/06/translation-of-laruelles-badiou-and-non-philosophy-a-parallel/ …