Is Swearing a Sin?

Fr. Mike comments on whether swearing, as in using vulgar language,
is a sin. He gives three times when using vulgar words can be
sinful: If I use the vulgar word against someone, directing it
toward them If I use a word connected to a sexual act, because sex
between persons is meant to be holy and reserved for spousal love
If I use a vulgar word in public, since it can scandalize
people—especially if young ones are present. Remember that we are
called to always be charitable. Our words mean something. We are
called to build people up, not bring them down. The words we choose
reflect and express what’s in our hearts “for out of the abundance
of the heart his mouth speaks” (Luke 6:45). What do you want to
express, words that are at best crude or words that build people
up?