I took the left, and for some cause unknown
Full fraught of hope and joy the way pursued,
Yet chose strong reasons speeding up alone
To fortify me ‘gainst a shock more rude.
E’en so the diver carrieth down a stone
In hand, lest he float up before he would,
And end his walk upon the rich sea-floor,
Those pearls he failed to grasp never to look on more.
Jean Ingelow, ‘The Australian Bell-Bird’ (1863?), stanza
Diving for Pearls 