Deep listening is the kind of listening that can help relieve the suffering of another person. You can call it compassionate listening. You listen with only one purpose: to help him or her to empty his heart. Even if he says things that are full of wrong perceptions, full of bitterness, you are still capable of continuing to listen with compassion. Because you know that listening like that, you give that person a chance to suffer less. If you want to help him to correct his perception, you wait for another time. For now, you don't interrupt. You don't argue. If you do, he loses his chance. You just listen with compassion and help him to suffer less.
Thích Nhất Hạnh is a Vietnamese Buddhist monk and peace activist.