•  And your Lord has decreed that you worship none but Him. And that you be dutiful to your parents. If one of them or both of them attain old age in your life, say not to them a word of disrespect, nor shout at them but address them in terms of honor.
•  And lower unto them the wing of submission and humility through mercy, and say : “My Lord ! Bestow on them Your Mercy as they did bring me up when I was small.”
• Your Lord knows best what is in your inner-selves. If you are righteous, then, verily, he is Ever Most Forgiving to those who turn unto Him again and again in obedience, and in repentance.
• And follow not ( i.e., say not, or do not witness not, etc.) that of which you have no knowledge ( e.g. to say, “I have heard ..”, or, “I have seen ..”, while in fact he has not heard or seen). Verily ! hearing, and the sight, and the heart, of each one of you will be questioned ( by Allah.)
•  And walk not on the earth with conceit and arrogance. Verily, you can neither rend nor penetrate the earth, nor can you attain the stature like the mountains in height.
•   All the bad aspect of these ( the above mentioned things) are hateful to your Lord.
• This is (part) of the al-hikmah ( wisdom, good manners, and high character, etc.) which your Lord inspired to you. And set not up with Allah any other god lest you should be thrown into Hell, blameworthy and rejected ( from His Mercy.)
•       (Translation from the Quran 17:33-39)

Web Source: The Quran

1. Respect and honour all human beings irrespective of their religion, color, race, sex, language, status, property, birth, profession/job and so on [17/70]
2. Talk straight, to the point, without any ambiguity or deception [33/70]
3. Choose best words to speak and say them in the best possible way [17/53, 2/83]
4. Do not shout. Speak politely keeping your voice low. [31/19]
5. Always speak the truth. Shun words that are deceitful and ostentatious [22/30]
6. Do not confound truth with falsehood [2/42]
7. Say with your mouth what is in your heart [3/167]
8. Speak in a civilized manner in a language that is recognised by the society and is commonly used [4/5]
9. When you voice an opinion, be just, even if it is against a relative [6/152]
10. Do not be a bragging boaster [31/18]
11. Do not talk, listen or do anything vain [23/3, 28/55]
12. Do not participate in any paltry. If you pass near a futile play, then pass by with dignity [25/72]
13. Do not verge upon any immodesty or lewdness whether surreptitious or overt [6/151].
14. If, unintentionally, any misconduct occurs by you, then correct yourself expeditiously [3/134].
15. Do not be contemptuous or arrogant with people [31/18]
16. Do not walk haughtily or with conceit [17/37, 31/18]
17. Be moderate in thy pace [31/19]
18. Walk with humility and sedateness [25/63]
19. Keep your gazes lowered devoid of any lecherous leers and salacious stares [24/30-31, 40/19].
20. If you do not have complete knowledge about anything, better keep your mouth shut. You might think that speaking about something without full knowledge is a trivial matter. But it might have grave consequences [24/15-16]

Words of Wisdom from the Qu’ran