Is "taking over" an idea from someone else the same as thinking it — and what distinguishes critical from uncritical thinking here?

Adopting a ready-made conclusion ("übernehmen") isn't yet thinking — uncritical thinking accepts a claim whole; critical thinking re-traces the reasons and could have rejected it.

Probing what "thinking" even is exposes the difference:

• Can someone think for you? You can be handed a conclusion, but you can't be handed the act of working it through — that part is unavoidably yours.
• Is "taking over" (übernehmen) also thinking? Only mechanically. If you absorb a view without engaging its grounds, you've copied an output, not performed the reasoning.
• Uncritical thinking = accepting (or repeating) a claim without examining its reasons or alternatives; the conclusion arrives pre-packaged and you wave it through.
• Critical thinking = you reconstruct why the claim might be true, weigh alternatives, and remain able to reject it. The mark of it is that the conclusion was earned, and could have come out otherwise.

So two people can voice the identical sentence and only one has thought it: the difference isn't the words but whether the reasons were genuinely traversed.

Tip: Quick test on any belief you hold — could you rebuild the argument for it from scratch, and name what would change your mind? If yes, you thought it. If you can only restate it, you took it over.