“719. One sword keepes another in the sheath.”
Jacula Prudentum (1651)
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George Herbert 216
Welsh-born English poet, orator and Anglican priest 1593–1633Related quotes

“We shall never sheathe the sword, which we have not lightly drawn”
Speech at Guildhall, 9 November 1914; see
Context: We shall never sheathe the sword, which we have not lightly drawn, until Belgium recovers in full measure all, and more than all, that she has sacrificed; until France is adequately secured against the menace of aggression; until the rights of the smaller nationalities of Europe are placed upon an unassailable foundation; and until the military domination of Prussia is wholly and finally destroyed.

“You will never know how sharp a sword is unless it's drawn from its sheath”

St. 2.
So, We'll Go No More A-Roving (1817)
“I mourn my sword, but that’s alright. Grandmother gave me another one.”
Source: Magic Breaks

Letter to Mr. George William Fairfax (31 May 1775) George Washington Papers http://memory.loc.gov/cgi-bin/query/r?ammem/mgw:@field(DOCID+@lit(gw030206)) at the Library of Congress
1770s

Private Richard Sharpe to the Tippoo Sultan, p. 372
Sharpe (Novel Series), Sharpe's Tiger (1997)

“The sword within the scabbard keep,
And let mankind agree.”
Source: Fables, Ancient and Modern (1700), The Secular Masque (1700), Lines 61–62.