How should we deal with sins?

Good morning, all brothers!

I have an interesting and insightful question for you and I’m really open to listen your thoughts. All of us were born to become saints. This is our unique opportunity! If we are here is because we sin. But I understand that there are two types of sin. The one that others CAN NOT see, maybe your thoughts or emotions regarding people. For instance, be an envious person. On the other hand, there are sin that others CAN see. Like, steal a bank during a business hours.

well, with that being said, what does God seek to teach us about this two possibilities of sinning? What are your thoughts about this?