Could I have inadvertently committed a mortal sin by buying and reading The Da Vinci Code? One cannot commit any sin “inadvertently.” A mistake cannot be a sin. Sin always is a deliberate act of one’s will. For a sin to be mortal or spiritually deadly, the matter involved has to be grave (or perceived to be grave), and ... http://72.14.203.104/search?q=cache:lBa6WamA5hAJ:www.dioceseoflincoln.org/snr/ask.htm+southern+nebraska+register+da+vinci&hl=en&gl=us&ct=clnk&cd=1