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Speaking is a beautiful folly:
with that man dance over all things.
How lovely is all talking and all the deception of sound!
-Friedrich Nietzsche

In truth we talk only to ourselves, 
but sometimes we talk loud enough that others may hear us.
-Kahlil Gibran

Everything I say, be talk, nothing be an advice.
I would not speak as boldly as if one had to follow me.
-Erasmus

Does my speech nourish me
or does it weaken me?
-Anonymous

If you keep talking,
you will end up saying what you didn't intend to say.
-Yiddish Folk Saying

It is extremely ignoble
to speak ill of others.
-Sivananda

If you speak negatively
you can expect that often you will be ignored and misunderstood
and have only a small amount of influence.
-Wu Wei

Reflect before you speak.
A foolish mouth can brand your soul.
-Yunus Emre

I like people who refuse to speak
until they are ready to speak.
-Lillian Hellman

Learn to control your tongue
and say to yourself:
"If I don't watch what I say,
I will never possess the real power of the Word.
-Omraam Mikhael Aivanhov

Before you speak, ask yourself:
is it kind,
is it necessary,
is it true,
does it improve on the silence?
-Sai Baba

Speak the truth.
Speak kindly.
Speak what is pleasant.
Speak what is helpful.
Speak what is needed.
Speak with intention.
Speak without criticism.
Speak independently.
Speak well.
-Nagarjuna

Never say anything
that you do not wish to be true for yourself,
for another person, or for circumstances.
-Roy Eugene Davis

He has ceased from rough words,
he holds himself far from rough words.
Words that are without offence,
cordial and urbane that delight many,
that encourage many: such words he speaks.
-Julius Evola

The most important things to say
are those which often I did not think necessary for me to say -
because they were too obvious.
-Andre Gide

Respectful to everyone in the world,
he speaks ill of none.
-Narsinh Mehta