And yet two years previously this same principle, after having been thinkable for many years, had become "unthinkable."
"Luck or Cunning?"
Samuel Butler
It is the two in one, and at the same time one in two, which is only two and two making five put before us in another shape; yet this fusion-so easy to think so long as it is not thought about, and so unthinkable if we try to think it-is, as it were, the matrix from which our more thinkable thought is taken; it is the cloud gathering in the unseen world from which the waters of life descend in an impalpable dew.
"Luck or Cunning?"
Samuel Butler
But it was, down to the last least detail which had made it thinkable for him to defy all his fellow-men to keep faith with four children whose lives and errand he'd interfered with.
"Long Ago, Far Away"
William Fitzgerald Jenkins AKA Murray Leinster