Catholics can only receive Holy Communion if they are in a state of grace, this is without any mortal sin: "A person who is conscious of grave sin (mortal sin) is not to celebrate Mass or receive the body of the Lord without previous sacramental confession unless there is a grave reason and there is no opportunity to confess; in this case the person is to remember the obligation to make an act of perfect contrition which includes the resolution of confessing as soon as possible."