Augustine, Confessions §aug_conf_12_005: So that when thought seeketh what the sense may conceive under this, and sait...

So that when thought seeketh what the sense may conceive under this, and saith to itself, "It is no intellectual form, as life, or justice; because it is the matter of bodies; nor object of sense, because being invisible, and without form, there was in it no object of sight or sense";--while man's thought thus saith to itself, it may endeavour either to know it, by being ignorant of it; or to be ignorant, by knowing it.