I have told you that the love between father and mother is holy, and the conception of a child is holy. And just as we don't make fun of holy things or talk about them in a careless way, so we must not talk about love and the birth of a baby disrespectfully. To help us, God puts into us, especially as we grow up, a special virtue called modesty, a shyness and fear which prevents us from leading ourselves or other people into temptation by bad talk or by actions that are dangerous to purity.

3. What purity means
Now I want to explain something else to you: what purity means, and what impurity means.

I'll start this way. God often makes the things that are good for us pleasant for us. For example, eating. We all like eating, don't we? God has made it pleasant for us, to encourage everyone to eat, because eating is good for us. Now, because He gave us free will, we can either use this power of eating properly, and enjoy it, as God meant us to do; or else we can misuse it, out of selfishness, by greediness and gluttony. That would be wrong, and a sin.

In the same way, God has made this act of love between a man and a woman, by which a baby is conceived, a great pleasure, so as to encourage parents to have children. But, God only means this pleasure to be for married people. For them, this act is a good and holy pleasure; but for anyone who is not married, this act is wrong and a very serious sin of impurity. So this means that if ever you were to try to get this pleasure, either by yourself or with someone else, it would be a mortal sin, if you did it deliberately and knowing what you were doing. I want to warn you about that, once and for all.

God has given our bodies these powers and pleasures, and