Tā pōufù xiānggào, tǎnchéng de shuō chū le nèixīn de xiǎngfǎ.
He spoke from the heart, honestly sharing his innermost thoughts.
Tips
usage
剖腹 has both a literal meaning (to cut open the belly, as in surgery) and a figurative one: 剖腹相告 or 剖腹陈言 means to speak candidly and sincerely, as if opening one's chest to reveal the heart.