Teaching
Many relationships weaken not from one major betrayal, but from repeated careless speech.
Meaning
Words leave impressions long after a conversation ends. Respectful speech is not formality; it is one of the daily protections of trust, affection, and dignity.
Practical Application
Remove one damaging speech habit from your close relationships: sarcasm, exaggeration, contempt, or using truth as a weapon.
Source
Mahabharata, Conduct and relationship themes
Attributed to: Vyasa