Mortal Sins and Grave Matter

When we look at mortal sins, we have to have something that is sufficiently grave offense against God or our fellow man in that sense. But he says that venial sins are only analogically so-called. They're not sins in the strict sense. And what he has in mind is basically when you sin, you take something other than God for the end of your life. So it's like you're driving down the road and you get in a catastrophic car accident. You're no longer making your way to the end.