“It is quite clear that if by sudden attack by an Enemy landed in strength our Dock-yards were to be destroyed our Maritime Power would for more than half a century be paralysed, and our Colonies, our commerce, and the Subsistence of a large Part of our Population would be at the Mercy of our Enemy, who would be sure to shew us no Mercy—we should be reduced to the Rank of a third Rate Power if no worse happened to us. That such a Landing is in the present State of Things possible must be manifest. No Naval Force of ours can effectually prevent it. … One night is enough for the Passage to our Coast, and Twenty Thousand men might be landed at any Point before our Fleet knew that the Enemy was out of Harbour. There could be no security against the simultaneous Landing of 20,000 for Portsmouth 20,000 for Plymouth and 20,000 for Ireland our Troops would necessarily be scattered about the United Kingdom, and with Portsmouth and Plymouth as they now are those Two dock yards and all they contain would be entered and burnt before Twenty Thousand Men could be brought together to defend either of them. … if these defensive works are necessary, it is manifest that they ought to be made with the least possible delay; to spread their Completion over 20 or 30 years would be Folly unless we could come to an agreement with a chivalrous Antagonist, not to molest us till we could inform him we were quite ready to repel his attack—we are told that these works might, if money were forthcoming be finished possibly in three at latest in four years. Long enough this to be kept in a State of imperfect Defence.”
Letter to Gladstone (15 December 1859), quoted in Philip Guedalla (ed.), Gladstone and Palmerston, being the Correspondence of Lord Palmerston with Mr. Gladstone 1851-1865 (London: Victor Gollancz, 1928), pp. 115-117.
1850s
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Henry Temple, 3rd Viscount Palmerston 72
British politician 1784–1865Related quotes

Letter to Arthur Ponsonby (16 December 1927); published in Semi-detached Idealists: The British Peace Movement and International Relations, 1854-1945 (2000) by Martin Ceadel, p. 271
1927

Often attributed to Stalin, there is not a single source which show that Stalin said this at any given time. There is only one source outside the blogosphere which attributes the quote to Stalin, but does not provide any evidence for the attribution. That source is the book Quotations for Public Speakers : A Historical, Literary, and Political Anthology (2001), p. 121 by the former US senator Robert Torricelli.
Misattributed

1960s

On 16 April 2016, addressing a large gathering at the University of Pretoria’s Mamelodi Campus, where the EFF had a memorial lecture on the life of Solomon Mahlangu, ‘White people must stop being cry-babies’: Malema http://businesstech.co.za/news/general/120579/white-people-must-stop-being-cry-babies-malema/ (16 April 2016)
Source: How to Stop Worrying and Start Living (1948), p. 110

2010s, Address to the United States Congress, Mercy Is 'What Pleases God Most

For My Legionaries: The Iron Guard (1936), Jewish Problem

Al-Manar television, February 2, 2005
Quote, 2005
Source: Britain Israel Communication & Research Centre http://www.bicom.org.uk/publications/