Allegory The expression by means of symbolic fictional figures and actions of truths or generalizations about human existence

Antimetabole Figure of emphasis in which the words in one phrase or clause are replicated, exactly or closely, in reverse grammatical order in the next phrase or clause; an inverted order of repeated words in adjacent phrases or clauses (A-B, B-A).

 "The absence of evidence is not the evidence of absence." -- Carl Sagan  "When you look into an abyss, the abyss also looks into you." -- Frederick Nietzsche

 We do not ride on the railroad ; it rides upon us.  But if we stay at home and mind our business, who will want railroads? We do not ride on the railroad; it rides upon us. Did you ever think what those sleepers are that underlie the railroad?  Walden, 2. Where I Lived and What I Lived For