THE NARRATION OF ‘Abdullāh ibn ‘Abbās 
about the story of ‘Umar 
in the previous chapter refers to this subject.
about the story of ‘Umar in the previous chapter refers to this subject.Know that it is of the utmost importance to pay attention to this point. It is wājib for every man to give advice and admonition and to tell anybody, whether young or old, to do good and not to do evil, unless he is convinced that some wickedness will result from the admonition. Allah 
says: “Invite (all) to the way of your Lord with wisdom and goodly preaching; and debate with them in the ways that are best.” [1].
says: “Invite (all) to the way of your Lord with wisdom and goodly preaching; and debate with them in the ways that are best.” [1].
The hadiths to this effect are innumerable. What many people do in neglecting this with people of high rank, imagining that they are doing so from modesty, is manifest error and obnoxious ignorance. It is not modesty; it is nothing but lassitude, disgrace, weakness and frailty, for modesty entails all good and brings about nothing but good. This [negligence, however], leads to evil and is not modesty. Modesty, according to the ‘ulamā’ who are people of intellect and understanding and the imams of careful investigation, is a quality of character that leads to discarding what is [morally] ugly, and prevents one from neglecting the rights of those entitled to them.
And this is in the same sense as that which we relate from al-Junayd in ar-Risālat al-Qushayriyyah: “Modesty is to see the blessings [of Allah] and to see [one’s own] shortcomings, so that they bring about in between them a condition called modesty.”
in ar-Risālat al-Qushayriyyah: “Modesty is to see the blessings [of Allah] and to see [one’s own] shortcomings, so that they bring about in between them a condition called modesty.”I have explained this at length at the beginning of the commentary on the Ṣaḥīḥ of Muslim; and praise belongs to Allah, and He knows best.
References
[1] Qur’ān 15:125.