It can become thematic in the unity of its temporal life, in the unity of that temporality which is the form of this life itself not the temporality of exact, natural scientific nature, which, according to its meaning, is the identical time of an absolutely identical nature beyond all the natures making up the surrounding worlds of whatever particular civilizations there may be; natural scientific time is not a relative time, essentially belonging to a particular communally living and existing civilization, with all its past periods and open future which, from the pclr of view of the man of the present, has meaning as his future, that of his civilization.