Thus in any case, for the sake of clarifying this and all other acquisitions of human activity, the concrete life world must first be taken into consideration; and it must be considered in terms of the truly concrete universality whereby it embraces, both directly and in the manner of horizons, all the built up levels of validity acquired by men for the world of their common life and whereby it has the totality of these levels related in the end to a world nucleus to be distilled by abstraction, namely, the world of straightforward intersubjective experiences.