بسم الله الرحمن الرحيم
‘Ali ibn Abi Talib رضي الله عنه said:
حَدِّثُوا النَّاسَ، بِمَا يَعْرِفُونَ، أَتُحِبُّونَ أَنْ يُكَذَّبَ، اللَّهُ وَرَسُولُهُ
“Narrate to people what they can understand; do you want Allah and His Messenger be lied against?” 
1. Ibn Hajr رحمه الله commented in his ‘Fath Al-Bari’:
وفيه دليل على أن المتشابه لا ينبغي أن يذكر عند العامة . ومثله قول ابن مسعود: ما أنت محدثا قوما حديثا لا تبلغه عقولهم إلا كان لبعضهم فتنة
“[In this narration] there is evidence that ambiguous knowledge should not be mentioned among the general public. And an example of this is (found in) the saying of Ibn Mas’ood, ‘Whatever you tell a people (anything) that their intellect don’t understand, will become a fitnah for some of them.’” 
2. Shaykh Muhammad Salih ibn al-‘Uthaymeen رحمه الله expounded on this important and often misunderstood point beautifully. After mentioning the narration of ‘Ali, he stated:
“It is therefore an aspect of wisdom in da’wah (calling others to Allah) that you should not surprise people with things they are unable to comprehend. Rather, you should call them in stages, bit by bit until their minds settle…
He continued saying:
“[The statement of ‘Ali] ‘Do you want Allah and His Messenger to be disbelieved?’ is a rhetorical question, posed as a criticism of such behaviour. It means: by narrating to people things they cannot understand do you want Allah and His Messenger to be disbelieved? This is because in such cases when you say, “Allah said, and His Messenger said” they will say you have lied if their minds cannot comprehend what you are saying. They are not disbelieving Allah and His Messenger per se, but they are disbelieving you for the speech you have attributed to Allah and His Messenger. Thus they will end up disbelieving Allah and His Messenger – not directly – but by way of the one who transmits this knowledge (i.e. you).
Now if it is said: Should we stop telling people things they cannot understand even if they need to know? The answer is: No, we do not leave this knowledge altogether, but we should tell them in a way that they will be able to understand. This is done by telling them in stages, bit by bit until they can accept the speech we want them to know, and they can feel comfortable with it. We do not abandon knowledge that people cannot understand and just say ‘this is something they will reject or dislike so we will not speak about it at all.’
The same is the case with acting upon a Sunnah that people are not used to and which they might find objectionable. We should act by this Sunnah, but only after informing people about it, such that they will be able to accept it and feel comfortable about it.
We learn from this narration (of ‘Ali) that it is important to employ wisdom in calling to Allah, and it is incumbent upon anyone who calls to Allah to consider the level of understanding of those he is inviting, and he should put everyone in its proper place.” 
3. What then of the confusion caused by Muslims who’re openly engaged on social media, discussing matters in public, which are usually privy in circles of knowledge. Imam Al-Dhahabi رحمه الله said:
وليجتنِبْ روايةَ المُشْكِلات مما لا تحملُه قلوبُ العامَّة فإن رَوَى ذلكَ؛ فليكُن في مجالسَ خاصّة
“Leave out relating difficult (and problematic info) that can’t be borne by the hearts of the general public. If such is narrated, then let it be in private gatherings.” 
4. Similar to this topic is the benefits we gain from understanding the wisdom behind the length of various Surahs of the Qur’an: http://tinyurl.com/3row8z2
1. Saheeh al-Bukhari, ‘Book of Knowledge’ (127): Whoever specified some people to teach them knowledge, preferring them over others for fear that others may not understand it.
2. Fath Al-Bari, 1/225
3. See, ‘Majmu’ Fatawa’, vol. 10, (pgs. 774-775)
4. Al Muwaqidha fi Mustalah al-Hadeeth, p.85