God’s being God is revealed in his mercy. Mercy is the expression of his divine essence.
Walter Kasper,
Mercy: The Essence of the Gospel and the Key to Christian Life

Forgiveness is not a sign of weakness, as we human beings tend to
think. God, we learn, expresses divine power not by getting even with
us when we do wrong, but by forgiving us: “[You] manifest your almighty
power above all by pardoning and showing mercy” (Collect, 26th Sunday in
Ordinary Time).
What about us? How do we live out of the divine mercy poured out on us? How do we witness to the divine life dwelling in us?
Do you not know
that you are God’s temple
and that God’s Spirit dwells in you?
(1 Cor 3:16).
One of the most important ways is to show
mercy — to live out of the merciful love which we cannot claim to
merit. And we remind ourselves — in our weakness, in our reluctance to
forgive — that we are always wrapped in the tender and merciful love of
God.
Oh, Mercy! … Wherever I turn my thoughts, I find nothing but mercy.
(Catherine of Siena, Dialogues, 30)
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Art by Eugène Burnand, "Heimgefunden" (Home Found), 1900
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For more reflections on mercy, go to "Caught Up in God."