Now it is meet that Helicon stream forth [versi] through me, and Urania help me with her choir to put in verse things difficult to think.Dante, Purgatorio, 29.40-2 [I]n every activity, whether sacred or profane, we must do our utmost to distinguish the two kinds of Love, for you may be sure that they will both be there.??? Plato, Symposium, 187e