"From the fact that the vital fluid is born with the body, that it grows, develops, and declines along with it, Lucretius infers that the fluid must also be dissolved simultaneously with the body, scattered into the air like smoke: — "ergo dissolvi quoque convenit omnem animai naturam, ceu fumus, in altas aëris auras; quandoquidem gigni pariter pariterque videmus crescere et, ut docui, simul ævo fessa fatisci.""