For example, let's see my question in Academia: I may not be admitted to the school that have the professor I have interest in. What should I do?
So I know that I shouldn't put all my eggs in one basket. In fact, I know most of the reasons behind the top answer. However, until that top answer appears, no answer and comment could enlighten me. The different between that answer and other answers is one single sentence in a whole answer:
Yes, that might mean changing your proposed research, but your research career will span decades; there's plenty of time to go back to your initial proposal later.
After reading this one, my mind is suddenly clear, and I feel that I don't need to read the rest of the answer to know what to do. It seems that my mind has been stuck somewhere, and this sentence unstuck it.
How should I call this sentence?