Ben Sira 22:19

19 If you stick something in your eye, tears will flow; and if you hurt a person deeply, you will discover his true feelings.

Ben Sira 22:19 In-Context

17 A mind that thinks things through intelligently is like a firm wall, finely decorated.
18 Small stones on top of a wall will not stay put when the wind blows, and a person whose stupid ideas have made him timid will not be able to stand up to frightening situations.
19 If you stick something in your eye, tears will flow; and if you hurt a person deeply, you will discover his true feelings.
20 If you throw rocks at birds, you will scare them away; and if you insult a friend, you will break up the friendship.
21 Even if you have a violent argument with a friend, and speak sharply, all is not lost. You can still make up with him. But any friend will leave you if you insult him, if you are arrogant, if you reveal his secrets, or if you turn on him unexpectedly.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.