Sirach 22:19-21

Revised Standard Version Catholic Edition

¹⁹ A man who pricks an eye will make tears fall,
    and one who pricks the heart makes it show feeling.
²⁰ One who throws a stone at birds scares them away,
    and one who reviles a friend will break off the friendship.
²¹ Even if you have drawn your sword against a friend,
    do not despair, for a renewal of friendship is possible.