Conceded that what is secure in our existence is but the sharp apex of the present moment between two hypothetical eternities, and all that is real in our experience but a series of fleeting impressions: [...] given, that we are never to get beyond the walls of the closely shut cell of one's own personality; that the ideas we are somehow impelled to form of an outer world, and of other minds akin to our own, are, it may be, but a day-dream, and the thought of any world beyond, a day-dream perhaps idler still: then, he, at least, in whom those fleeting impressions --faces, voices, material sunshine-- were very real and imperious, might well set himself to the consideration, how such actual moments as they passed might be made to yield their utmost, by the most dexterous training of capacity.
--Walter Pater, Marius the Epicurean, II, "New Cyrenaicism"








