the term repentance in greek is 'metanoia', meaning a radical change of mind, more than merely saying sorry, but a desire to change a whole way of life, jesus gave many illustrations of repentance and forgiveness, e.g. jesus' parable of the lost son describes a son who, having squandered his inherentence on a selfish lifestyle, realises his only hope is to return to his father's house and beg for forgiveness, jesus taught that forgiveness and mercy should always come first and we shoould not judge others without looking at our own shortcomings first, for example in john's gospel jesus states to a group who are about to stone an adulterer to death 'those among you who are without sin be the first to throw the stone at her', when asked how many times a sin should be forgiven, jesus said 'seventy times seven'