The Sapir Whorf Truism is a form of the SapirWhorfHypothesis that has been sufficiently weakened so as to be "obviously" true.
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Or from a humorous point of view... Why that would be, um..., what's the word for it?

It's too vague to be put in words.

What we think of as language influences our thinking, and what we speak of as thinking influences our language.

Are you criticizing what I'm saying, or the way I'm saying it? ''Not being a mind reader, how do I tell the difference?''

Some people's speech is NOT controlled by their thoughts. ...''Many thoughts of many people are not controlled by their speech.''