Tot species, tantosque ortus variosque novatus una dies aperit, conficit ipsa dies.
So many lovely things, so rare, so young,
A day begat them, and a day will end.
"De Rosis Nascentibus", line 39; translation from Helen Waddell Mediaeval Latin Lyrics ( 1943) p. 29.
This poem used to be misattributed to Virgil, but is now usually ascribed to Ausonius.