“Oh who can tell, save he whose heart hath tried.”
George Gordon Byron (1788–1824) English poet and a leading figure in the Romantic movement
Canto I, stanza 1; this can be compared to: "To all nations their empire will be dreadful, because their ships will sail wherever billows roll or winds can waft them", Dalrymple, Memoirs, vol. iii, p. 152; "Wherever waves can roll, and winds can blow", Charles Churchill, The Farewell, Line 38.
The Corsair (1814)