Set a watch, O Lord, upon our tongue:
that we never speak the cruel word
which is untrue;
or, being true, is not the whole truth;
or, being wholly true, is merciless;
for the love of Jesus Christ our Lord.
Eric Milner-White (1884-1963) and G.W. Briggs (1875-1959) Anglican clergymen
The Book of a Thousand Prayers
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Ephesians 4:29
Do not let any unwholesome talk come out of your mouths,
but only what is helpful for building others up according to their needs,
that it may benefit those who listen.
prayer & verse 
I love the nuances of the use of our tongue in this prayer. We can fall in various subtle ways.
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