This is always the danger with propaganda, that it becomes at last more credible to its disseminators than to its targets.

Garry Wills (b. 1934) American author, journalist, historian

The Kennedy Imprisonment: A Meditation on Power, ch. 18 (1981)
    (Source)

Referring to US government efforts in the early 60s to paint Castro's regime in Cuba as weak, eventually leading to the US government itself thinking the regime could be easily toppled.