You do not believe that souls are assigned, first to one body and then to another, and that our so-called death is merely a change of abode? You do not believe that in cattle, or in wild beasts, or in creatures of the deep, the soul of him who was once a man may linger? You do not believe that nothing on this earth is annihilated, but only changes its haunts? And that animals also have cycles of progress and, so to speak, an orbit for their souls, no less than the heavenly bodies, which revolve in fixed circuits? Great men have put faith in this idea; therefore, while holding to your own view, keep the whole question in abeyance in your mind. If the theory is true, it is a mark of purity to refrain from eating flesh; if it be false, it is economy. And what harm does it do to you to give such credence? I am merely depriving you of food which sustains lions and vultures.〔Seneca, ''Epistles'', 〕