The Vedanta recognizes no sin it only recognizes error. And the greatest error, says the Vedanta is to say that you are weak, that you are a sinner, a miserable creature, and that you have no power and you cannot do this and that.
The greatest sin is to think yourself weak
Strength and manliness are virtue; weakness and cowardice are sin.
...Really, there is no greater sin than cowardice; cowards are never saved - that is sure. I can stand everything else but not that.
No cowardice, no sin, no crime, no weakness - the rest will come of itself. . .
The greatest sin is to think that you are weak. No one is greater: realize that you are Brahman. Nothing has power except what you give it.
Our religion teaches that anger is a great sin, even if it is "righteous".