Emily Dickinson
THE MYSTERY OF PAIN.
Pain has an element of blank;
It cannot recollect
When it began, or if there were
A day when it was not.
It has no future but itself,
Its infinite realms contain
Its past, enlightened to perceive
New periods of pain.
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to enlighten [in'lait(ə)n], [en-] - поэт. прояснять, проливать свет (на что-л.)