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Sins of commission, is a category of sin describing the things we did and shouldn't have. I committed (commission) a sin when I lied and I shouldn't have.
The second, sins of omission, are the category that encompasses the sins of not doing what we should have. We don't think as much about the sin of omission even though it is as pernicious and destructive as anything we could commit. I should have testified because I knew he was innocent, but I didn't out of fear. When we know the right thing to do and don't, that's a sin.
What are Sins of Omission and Commission