At last I came to the conclusion that I might keep them if I treasured them only as a remembrance of what was irrevocably past and gone, never to be looked back on any more, in any other light.
If I felt that I could ever give him the best right he could have to be my protector, and if I felt that I could happily and justly become the dear companion of his remaining life, superior to all lighter chances and changes than death, even then he could not have me bind myself irrevocably while this letter was yet so new to me, but even then I must have ample time for reconsideration.
There are no more uses of "irrevocable" in the book.
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If you sign the document, you are giving them irrevocable permission to...