“Flattery, in Tuppence’s opinion, should always be laid on with a trowel where a man is concerned.”

1975

"Runcorn Ferry", line 21.
Albert, 'Arold and Others (1938)

Lady Bracknell, Act I
The Importance of Being Earnest (1895)
Source: The Importance of Being Earnest and Other Plays

From 'Om man så må sige – 350 Dronning Margrethe-citater', quoted in English here http://trondni.blogspot.co.uk/2012/11/new-books-wit-and-wisdom-of-margrethe-ii.html.
Life Philosophy

Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

The Last Years of a Rebel (1967)

"The Privilege of the Grave" (1905)

1900s, The Strenuous Life: Essays and Addresses (1900), National Duties
Variant: No hard and fast rule can be laid down as to where our legislation shall stop in interfering between man and man, between interest and interest.
Context: No hard-and-fast rule can be laid down as to where our legislation shall stop in interfering between man and man, between interest and interest. All that can be said is that it is highly undesirable, on the one hand, to weaken individual initiative, and, on the other hand, that in a constantly increasing number of cases we shall find it necessary in the future to shackle cunning as in the past we have shackled force. It is not only highly desirable but necessary that there should be legislation which shall carefully shield the interests of wage-workers, and which shall discriminate in favor of the honest and humane employer by removing the disadvantage under which he stands when compared with unscrupulous competitors who have no conscience and will do right only under fear of punishment. Nor can legislation stop only with what are termed labor questions. The vast individual and corporate fortunes, the vast combinations of capital, which have marked the development of our industrial system create new conditions, and necessitate a change from the old attitude of the state and the nation toward property.

250 U.S. at 628.
1910s, Abrams v. United States, 250 U.S. 616 (1919)