get to the heart of

get to the heart of  {v. phr.}
To find the most important facts about or the central meaning of; understand the most important thing about.
You can often get to the heart of people's unhappiness by letting them talk.
"If you can find a topic sentence, often it will help you get to the heart of the paragraph," said the teacher.
Categories: verb
Source: A Dictionary of American Idioms

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