Good advice, no matter what the specifics are. :)
Yes. Now, delve into what this concept says implicitly...
That the saints in heaven are not only watching you, but can also aid you, as well... If they were merely watching and not able to influence or effect anything, than we wouldn't care if they were watching or not.
I believe that the angels are not the only ones rejoicing in heaven when a sinner turns back to God.
Regards