What is a sin?
The five types of sin:
1. transgression -- Disobedience to the LORD GOD's Law
2. unrighteousness -- Unjust, immoral and wrong
3. omission of known duty -- Failing to do good works
4. faithlessness -- Failing to act on faithful conviction
5. and foolish thinking -- Wicked or reckless planning
http://www.guidedbiblestudies.com/001sin1.htm
According to the catholic church, there are main classification of sins: MORTAL and VENIAL.
Venial sins are considered 'mild' (my words) while Mortal ones are considered 'grave'. The venial one does not break the covenant with God, so i'll only write about Mortal
For a sin to be mortal, it has to be:
--of Grave matter
--commited with full knowledge
--commited with full consent (done voluntarily)
http://www.catholicdoors.com/faq/qu06.htm
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tonk nih ti? rettut sid id.