Sermons about Sin

I heard a sermon online yesterday from my Pastor. It was about grace and God's views on sin. I'm all about technicalities when it comes to my sins. Like if I do something I always seem to put a spin on it so it doesn't sound so bad. But my pastor said that to God it's not about the exact sin. It's about your heart and what is going on inside of you.
It's like I finally got it and it came together for me. Thats what the lady I talk to once a week has been trying to say. It doesn't matter how far I go, because the sin has already taken place in my heart. It's like Jesus said in Matthew about how looking at a woman is committing adultery. I get that. It doesn't make me feel good about myself, but I finally get it.