“This was said by the Blessed One, ‘Whoever ignorantly deprives a living being of life accumulates great demerit.’ Yet in the training rule for monks concerning killing living beings he says, ‘There is no offence if he does not know.’ How can both of these statements be true?” “There are offences where there is no escape for one who does not know and there are offences where there is an escape. It was in regard to this second kind of offence that the Blessed One said there is no offence if he does not know."
http://www.scribd.com/doc/17465319/Abri ... er_page_95
"Which is the greater demerit, conscious or uncon- scious wrongdoing?” “Unconscious wrong-doing, O King “Then we should doubly punish those who do wrong unconsciously.” “What do you think, O king, would a man be more seriously burned if he seized a red-hot iron ball not knowing it was hot than he would be if he knew.” “He would be burned more severely if he didn’t know it was hot.” “Just so, O king, it is the same with the man who does wrong unconsciously."
http://www.scribd.com/doc/17465319/Abri ... er_page_70
A special thanks to Venerable Pesala to whom we owe for the translation.