Broken heart

The most whole thing in the entire world is a broken heart (The Kotzker Rebbi)

The sacrifices of G-d are a broken spirit; a broken and a contrite heart, O G-d, Thou wilt not despise. (Pslams 51:19)

" Thus did they say in Peshischa:

A person is compared to clay vessels and his spirit and soul are likened to the dirt out of which earthenware vessel is made. If a dish becomes impure, it is drawn through fire or dipped into water and becomes pure again, but the earthenware vessel - only breaking it brings it into purity...

Fortunate is the man who finds purity in all places, even when he falls and is told, "Go away, impure one". Because his heart is broken,  impurity leves him.

They also used to say: A broken heart-but not a depressed one. A broken spirit, yes: a dejected one-absolutely not! The broken heart cries over what it had destroyed and damaged, while the depressed heart cries that it has been damaged and destroyed...

Let the depressed heart be banished and sit in its agony; bring the broken heart into the chamber and let it be clothed in greatness. This is true greatness, which comes after heartbreak, greatness that will last forever"

Eliahu Kitov, Sharp as a needle: Seven stories from the world of Peshischa and Kotzker chassidus, Book 2,  p.71