Translation
(and a sword will go through your heart also)
Go to footnote numberso that the thoughts of the hearts of many will be revealed.”
Go to footnote numberParaphrase
So that the thoughts of many hearts will be revealed (and a sword will pierce your heart also).”
Footnotes
1: “your heart also”
The Greek text includes this phrase as what we would call a parenthetical clause, and does so in the middle of the sentence. For us in English it makes more sense to place it at the end of the sentence.
2: “will be revealed”
Jesus issues a simple call which one must respond to with obedience or defiance. The way we choose to respond to Jesus reveals what is in our hearts.