James Fenimore Cooper,
The Prairie — Chapter XIV
(1827)
“ Ellen continued, "neither to reveal the contents of that tent, nor to help its prisoner to escape. We are both solemnly, terribly, sworn; our lives perhaps have been the gift we received for the promises. It is true you are masters of the secret, but not through any means of ours; nor do I know that I can justify myself, for even being neutral, while you attempt to invade the dwelling of my uncle in this hostile manner." ”
