Proverbs 14:10

10The heart knows its own abitterness,
and no stranger shares its joy.

Isaiah 38:15-17

15What shall I say? For he has spoken to me,
and he himself has done it.
bI walk slowly all my years
because of the bitterness of my soul.
16 cO Lord, by these things men live,
and in all these is the life of my spirit.
Oh restore me to health and make me live!
17 dBehold, it was for my welfare
that I had great bitterness;
ebut in love you have delivered my life
from the pit of destruction,
ffor you have cast all my sins
behind your back.
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