HOW THE QUR'AN TEACHES TO SPEAK ?

Speak softly (Koran, 20;44)
Speak to Justice (Koran, 6;152)
And tell only the truth (Koran, 33;70)
Speak what is best (Koran, 17;53)
Speak politely (Koran, 17;23)
Avoid idle words (Koran, 20;44)
Be nice to your parents, relatives, orphans and the poor (Koran, 2;83)
stay away from false words (Koran, 22;30)
Do not spy and do not gossip about each other (Koran, 49;12)
Be patient, sincere and pious (Koran, 3;17)