“A weak enemy in the fortress is more fearsome than the strongest outside.”
Ein schwacher Feind in der Festung ist fürchterlicher als der stärkste von außen.
Ardinghell and the Blessed Islands (1787).
Original
Ein schwacher Feind in der Festung ist fürchterlicher als der stärkste von außen.
Aphorismen
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Johann Jakob Wilhelm Heinse 1
German writer 1746–1803Related quotes

“Even the strongest spirits have the moments of irresistible weakness”
Source: The Cave (2000), p. 15 (Vintage 2003)

“Better make a weak man your enemy than your friend.”
Affurisms. From Josh Billings: His Sayings (1865)

"The circle game"
Selected Poems 1965-1975 (1976)
Context: The weapons
that were once outside
sharpening themselves on war
are now indoors
there, in the fortress,
fragile
in glass cases; Why is it
(I’m thinking
of the careful moulding
round the stonework archways)
that in this time, such
elaborate defences keep
things that are no longer
(much)
worth defending?

Institutes of the Laws of England, Second Part, vol. 1 (1642), Notes to Ch. XXIX of the Charter [Magna Carta], paragraph 1391 http://oll.libertyfund.org/index.php?option=com_staticxt&staticfile=show.php&title=912&search=%22tutissima%22&chapter=61105&layout=html#a_1375898
Institutes of the Laws of England

“A weak invention of the enemy.”
Act V, scene 3. Similar thought in William Shakespeare, King Richard III.
Richard III (altered) (1700)