Maritain's philosophy is based on the view that metaphysics is prior to epistemology. Being is first apprehended implicitly in sense experience, and is known in two ways. First, being is known reflexively by abstraction from sense experience. One experiences a particular being, e.g. a cup, a dog, etc. and through reflexion ("bending back") on the judgement, e.g. "this is a dog", one recognizes that the object in question is an existent. Second, in light of attaining being reflexively through apprehension of sense experience one may arrive at what Maritain calls "an Intuition of Being". For Maritain this is the point of departure for metaphysics; without the intuition of being one cannot be a metaphysician at all. The intuition of being involves rising to the apprehension of ens secundum quod est ens (being insofar as it is a being). In Existence and the Existent he explains:

"It is being, attained or perceived at the summit of an abstractive intellection, of an eidetic or intensive visualization which owes its purity and power of illumination only to the fact that the intellect, one day, was stirred to its depths and trans-illuminated by the impact of the act of existing apprehended in things, and because it was quickened to the point of receiving this act, or hearkening to it, within itself, in the intelligible and super-intelligible integrity of the tone particular to it." (p. 20) 

http://en.wikipedia.org/wiki/Jacques_Maritain

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CR