“Always when you are about to say anything, first weigh it in your mind; for with many the tongue outruns the thought.”
Verse 41.
To Demonicus
Context: Always when you are about to say anything, first weigh it in your mind; for with many the tongue outruns the thought. Let there be but two occasions for speech — when the subject is one which you thoroughly know and when it one on which you are compelled to speak. On these occasions alone is speech better than silence; on all others, it is better to be silent than to speak.
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Isocrates 23
ancient greek rhetorician -436–-338 BCRelated quotes

"I am the Greatest" (1964)
Context: I am the man this poem’s about,
I’ll be champ of the world, there isn’t a doubt.
Here I predict Mr. Liston’s dismemberment,
I’ll hit him so hard; he’ll wonder where October and November went.
When I say two, there’s never a third,
Standin against me is completely absurd.
When Cassius says a mouse can outrun a horse,
Don’t ask how; put your money where your mouse is!
I AM THE GREATEST!

“Every thought you produce, anything you say, any action you do, it bears your signature.”
Source: Peace Is Every Step: The Path of Mindfulness in Everyday Life

“Hold your tongue; you won't understand anything. If there is no God, then I am God.”
Kirilov, Part III, Ch. VI, "A busy night"
The Possessed (1872)