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And I will place within them as a guide My umpire conscience, whom if they will hear Light after light well used they shall attain, And to the end persisting, safe arrive.

1665 Paradise Lost (published 1667), bk.3, l.194-7.
And I will place within them as a guide My umpire conscience, whom if they will hear Light after light well used they shall attain, And to the end persisting, safe arrive.