 Our empirical knowledge of objects and objective events and properties, the generalizations they support concerning patterns of objective events and properties, and the use we make of all this for further inductions, has a complex “many-storied character”. Nonetheless, the “whole edifice still rests at bottom on these primitive generalizations which we make in terms of direct experience” (Lewis 1946, 261). (Lewis (1929, 332; 1946, 261) contrasted these primitive generalizations that underlie our objective beliefs with what he says we normally call “empirical generalizations” that concern patterns of objective events and may formulate natural laws supporting causal explanations.) However, the empirical justification for these primitive generalizations and ultimately for our objective beliefs can’t rest on current sense experience alone and requires evidence concerning the past. At the same time, what is given to us isn’t the past itself about which we can never be certain, but just current sense presentation and current recollection or sense of past experience. 