Teaching
Correction given in anger usually wounds more than it reforms.
Meaning
A heated mind often believes it is speaking truth, but anger mixes truth with force, impatience, and ego. Wisdom asks that correction be timely, clear, and free from inner heat.
Practical Application
If you must address a mistake, wait until your tone becomes steady. Keep the point specific, avoid humiliation, and speak to improve the person rather than to release your irritation.
Source
Bhagavad Gita, Themes of steadiness and self-mastery
Attributed to: Sri Krishna