Ephesians 4:25, 29
Therefore each of you must put off falsehood and speak truthfully to your neighbor, for we are all members of one body.
Do not let any unwholesome talk come out of your mouths, but only what is helpful for building up others according to their needs, that it may benefit those who listen.
Sometimes people say hurtful things because it is "the truth". But the truth is not always helpful and does not always encourage or build up another. In those cases, we remember the old saying,"If you can't say something nice, don't say anything at all." Even though this saying is not directly biblical, it incorporates both of these verses. The truth isn't always pretty, and sometimes can be hurtful.
Holy Lord, help me to watch my words, and only speak in truth. At the same time, help me to hold my tongue when even the truth is not helpful. Help me to listen more than I speak. Amen