I refrain from describing what I want to say before I have a chance to search my brain for related concepts to convey or contrast my thoughts. Then I can decide if the thing I'm about to say matches how I feel about the subject.
If you feel like your language is determining your thoughts, then I recommend (aside from possibly bilingualism) just taking more time to choose your words. Supposedly, the "decision-making centers" in the brain tend to activate prior to the parts responsible for understanding and reasoning ... apparently implying that humans usually rationalize decisions we've already made rather than reasoning beforehand.
Then again, I'll digress because I also do that to compensate for my poor communication and multitasking skills, so others may not share my thinking style and limitations.
I think the effect takes a lot of different forms. It can happen as a result of connotations or homonyms of certain words. Or it can come down to artistic considerations. For example, one might prefer to express an idea in slightly different language that is less effective but more poetic sounding. Or maybe the author thinks it would be thrilling to make a very grand sounding statement when they had originally set out to touch on something more specific. And so the language ends up forming the idea just as much as it's meant to communicate it.
I think this is clearly evident in political debates where people talk themselves into a frenzy.