Sin is an offence against God by thought, word, deed or omission.
Sin is an offence against reason, truth and right conscience.
Sin is a failure in genuine love for God and neighbour. Sin and wounds the nature of man and injures human solidarity. Sins can be distinguished according to their objects , as can every human act. Sins can be distinguished according to the virtues they oppose , by excess or defect, or by commandments they violate . Sins can be classed according to the person they concern , whether they concern God, neighbour or oneself.