"You are one of them ... your speech shows it." Mark 14:70
You can try to disguise your identity by changing your looks, your social circle and your address - but how you speak will give you away every time. It happened to Peter. (Mark 14:67 - 71). Isn't it interesting how public profanity in any language, has a way of making others question the quality of your relationship with Christ?
Paul says, "Do not let any unwholesome talk come out of your mouths, but only what is helpful for building others up ... that it may benefit those who listen" (Eph 4:29). If you want to win people to Jesus, be careful how you talk. Paul said, "Let your speech always be with grace ... that you may know how you ought to answer each one" (Col. 4:6).
Words are powerful things. They either build up or tear down, add to or take from. It is not important that people can tell from your accent where you are from, but when they cannot tell by the way you talk that you are Christ's disciple, something is seriously wrong.