Now, then, of air I'll speak, which hour by hour in all its body Is changed innumerably. For whatso'er Streams up in dust or vapour off of things, The same is all and always borne along Into the mighty ocean of the air; And did not air in turn restore to things Bodies, and thus recruit them as they stream, All things by this time had resolved been And changed into air. Therefore it never Ceases to be engendered off of things And to return to things, since verily In constant flux do all things stream. Likewise, The abounding well-spring of the liquid light, The ethereal sun, doth flood the heaven o'er With constant flux of radiance ever new, And with fresh light supplies the place of light, Upon the instant. For whatever effulgence Hath first streamed off, no matter where it falls, Is lost unto the sun. And this 'tis thine To know from these examples: soon as clouds Have first begun to under-pass the sun, And, as it were, to rend the rays of light In twain, at once the lower part of them Is lost entire, and earth is overcast Where'er the thunderheads are rolled along-- So know thou mayst that things forever need A fresh replenishment of gleam and glow, And each effulgence, foremost flashed forth, Perisheth one by one. Nor otherwise Can things be seen in sunlight, lest alway The fountain-head of light supply new light. Indeed your earthly beacons of the night, The hanging lampions and the torches, bright With darting gleams and dense with livid soot, Do hurry in like manner to supply With ministering heat new light amain; Are all alive to quiver with their fires,-- Are so alive, that thus the light ne'er leaves The spots it shines on, as if rent in twain: So speedily is its destruction veiled By the swift birth of flame from all the fires. Thus, then, we must suppose that sun and moon And stars dart forth their light from under-births Ever and ever new, and whatso flames First rise do perish always one by one-- Lest, haply, thou shouldst think they each endure Inviolable.