“Lest the awe should dwell — And turn your frolic to fret — You shall look on my power at the helping hour — But then you shall forget!”

Rat telling Mole of the words he hears in the reeds, Ch. 7
The Wind in the Willows (1908)
Context: Now it is turning into words again — faint but clear — Lest the awe should dwell — And turn your frolic to fret — You shall look on my power at the helping hour — But then you shall forget! Now the reeds take it up — forget, forget, they sigh, and it dies away in a rustle and a whisper. Then the voice returns —
'Lest limbs be reddened and rent — I spring the trap that is set — As I loose the snare you may glimpse me there — For surely you shall forget! Row nearer, Mole, nearer to the reeds! It is hard to catch, and grows each minute fainter.
'Helper and healer, I cheer — Small waifs in the woodland wet — Strays I find in it, wounds I bind in it — Bidding them all forget!