The verses are of the poem Col. Brandon reads Marianne when she is recovering of her illness. I’ve heard it several times, but I don’t understand it completely. Shouldn’t be another negative particle after “may”, so that two negations make an affirmation? Written like this I understand that it is impossible to find something lost even if searching it, but I guess that the poet meant just the contrary.
Can you please help me, English-speaking readers?