johnnyt3000 asks about sin : **"[Some people] were talking badly about someone they knew, … one of the people that were involved in that conversation was sitting next to me,
were they gossiping? If so,
did I have an obligation to speak up and tell them to stop?"**
It might be gossiping … it might NOT be gossiping.
You were there. Did it sound like Gossip to you?
I imagine that you have heard juicy Gossip being dispensed at least a couple times in your Life.
If it seemed like that … then, you probably have your answer.
What type of Obligation are you referring to?
A moral obligation … a social obligation … a religious obligation ?
Are you trying to ask if speaking up (or NOT speaking up) is a religious obligation?
Well, anyway, Jesus told us to NOT JUDGE others (for their behaviors). So, if you Judged that person, it would seem to violate that admonition.
"The other question … if you see a piece of trash on the floor, or in the street, do you have to pick it up and throw it away?"
Why do you ask this?
Haven’t you walked past litter 1000s of times in your Life?
Well, if it is a used soda-bottle, it (in most states) has a Redemption Value.
So, theoretically, if you grabbed it, and removed it … a person could accuse you of stealing it.
"Do I need to go to confession?"
If a soda-bottle owner accuses you of stealing his soda-bottle … then YES, I think you should go confess it.