Sister ran out of room before mentioning this point from Sunday's Gospel..

"Jesus said to his disciples:
"If your brother sins against you,
go and tell him his fault between you and him alone. 
If he listens to you, you have won over your brother.
If he does not listen,
take one or two others along with you,
so that 'every fact may be established
on the testimony of two or three witnesses.'
If he refuses to listen to them, tell the church. 
If he refuses to listen even to the church,
then treat him as you would a Gentile or a tax collector."