In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Imaam Al-Awzaa’ee [rahimahullaah] said, “If Allaah wishes to deprive a servant of His the blessing of knowledge, He places the Aghaaleet on his tongue”. 
What Are The Aghaaleet
Shaikh Abdur Razzaaq Al-Badr [hafidhahullaah] said, “The intent behind the word Aghaaleet are the odd issues and their difficulties which a person pursues whilst exceeding the limits and harboring an evil intent when questioning and thus results in doubts, so debate becomes rife and argumentation increases. Therefore, whoever’s desire is confined to pursuing the odd issues and not to acquire understanding from Allaah [i.e. the Qur’aan] and the Messenger [i.e. the Sunnah], and knowledge of the prescribed limits in what has been legislated which leads to action, then indeed he has wasted his time and has been deprived of the blessing of knowledge”.
What Leads a Person to Misguidance?
This occurs based on Allaah’s Perfect Wisdom and Just Decree, as recompense for one’s wickedness (a); due to a hidden plot in one’s heart (b); due to one turning away from guidance and behaving as if he does not know Allaah’s guidance (c); turning away from Allaah’s reminder, which he revealed to his Messenger, turning away from understanding it and pondering upon it, and that which Allaah intends by way of it, so Allaah leaves such a person with his devil as a punishment – the devil that follows him. So, this devil becomes his ally (d); because none submits to Allaah sincerely and truthfully, and performs the deeds of the people of Jannah, except that Allaah will never abandon him. (e) Such a person was not compelled to go astray, rather he made a choice, but his choice is under the Will of Allaah. We do not know what was in the hearts of those who deviated, so Allaah deviated their hearts; but we know – with absolute certainty – that Allaah passes Just Judgments and He does not do injustice to anything; rather it is the people who wrong themselves. (f) 
Allaah [The Most High] said:
يَا أَيُّهَا الَّذِينَ آمَنُوا اسْتَجِيبُوا لِلَّهِ وَلِلرَّسُولِ إِذَا دَعَاكُمْ لِمَا يُحْيِيكُمْ ۖ وَاعْلَمُوا أَنَّ اللَّهَ يَحُولُ بَيْنَ الْمَرْءِ وَقَلْبِهِ وَأَنَّهُ إِلَيْهِ تُحْشَرُونَ
O you who believe! Answer Allaah (by obeying Him) and (His) Messenger when he calls you to that which will give you life, and know that Allaah comes in between a person and his heart (i.e. He prevents an evil person to decide anything). And verily to Him you shall (all) be gathered. [8:24]
Imaam Ibnul Qayyim [rahimahullaah] stated: And regarding the statement of Allaah: [وَاعْلَمُوا أَنَّ اللَّهَ يَحُولُ بَيْنَ الْمَرْءِ وَقَلْبِهِ وَأَنَّهُ إِلَيْهِ تُحْشَرُونَ – And know that Allaah comes in between a person and his heart (i.e. He prevents an evil person to decide anything). And verily to Him you shall (all) be gathered].
The First Explanation Regarding This Above Aayah: It is well known that Allaah is the one who intervenes between the believer and disbelief, and between the disbeliever and Eemaan, between the people of obedience and their disobedience to Him, and between the people of disobedience and their obedience to Him. This is the saying of Ibn Abbaas and that of the majority of the Mufassiroon.
The Second Explanation is that Allaah is close to the heart of the human [by His knowledge] and no secret is hidden from Him. This was mentioned by Al-Waahidiy from Qataadah. And it appears that this statement [reported from Qataadah] is more in conformity with the context [of the Ayah (i.e. ‘And know that Allaah comes in between a person and his heart]; because the basis of this Istijaabah [i.e. responding to the call of Allaah and His Messenger] is by way of the heart. A bodily response is of no benefit without the response of the heart; because Allaah comes between a person and his heart and knows whether the person has responded to Him with his heart or hides the opposite of that.
And concerning the first saying [i.e. the saying of Ibn Abbaas and the majority of the Mufassiroon], it is with regards to the fact that if you turn away from [responding to the call of Allaah and His Messenger], you will not be safe and thus Allaah comes between you and your hearts as a punishment for abandoning [this response] after the truth had been explained and made clear. So, you will be like what (has been mentioned) in the statement of Allaah: [ وَنُقَلِّبُ أَفْئِدَتَهُمْ وَأَبْصَارَهُمْ كَمَا لَمْ يُؤْمِنُوا بِهِ أَوَّلَ مَرَّةٍ – And We shall turn their hearts and their eyes away (from guidance), as they refused to believe therein for the first time]. [6:110]
And Allaah said: [فَلَمَّا زَاغُوا أَزَاغَ اللَّهُ قُلُوبَهُمْ – So when they turned away (from the Path of Allaah), Allaah turned their hearts away (from the Right Path)].[61:5] And Allaah said: [فَمَا كَانُوا لِيُؤْمِنُوا بِمَا كَذَّبُوا مِنْ قَبْلُ – But they were not such as to believe in that which they had rejected before].[7:101] This ayah is a warning against [failing to respond] with the heart even if response had been made by way of the limbs. 
Shaikh Ubaid Bin Abdillaah Al-Jaabiri [hafidhahullaah] said:
There is none who hides behind the Sunnah– the people beguiled by him, gathered around him to learn, adhered to him, became dependent on him and accepted everything he said–except that Allaah will reveal his affair, uncover and expose his concealed state of affairs to specific individuals and to the general public, regarding what was hidden and apparent of his deception, his mixing truth with falsehood, his plots and deceitful practices. Allaah facilitates men of virtue, intelligence, wisdom, strength and exceptional natural ability–possessors of knowledge, skill and sound understanding of the religion–through whom He (Allaah) unveils the affair of that trickster, dubious and deceitful person. 
One of Those Deviants Is Yasir Qadhi [may Allaah guide him or restrain his tongue Aameen]
 Jaami Bayaan Al-Ilm 1087]
: https://al-badr.net/muqolat/2693. Paraphrased]
 a. See Tafseer As-Sadi, Surah Israa. Aayah 5; b. See Sharh Arba’een page 87-88. 1st edition. 1424 (2003); c. Zaadul Maseer. Tafseer Surah Az-Zukhruf Aayah 36; d. Al-Jawaab Al-Kaafee 136-137. By Imaam Ibnul Qayyim; e. See Sharh Arba’een page 88. 1st edition. 1424 (2003)- By Shaikh Uthaymeen; f. Sharh Al-Arba’een pages 55-56- 1st edition 1428 (2007)-by Shaikh Saaleh Aaala As-Shaikh].
: [Source: Al-Fawaa’id. Pages 140-144.slightly paraphrased]