Shaykh Muhammad bin Salih al-Uthaymeen [d. 1420H] said in Sharh al-Aqeedah al-Wasiteeyah:
Having Eemaan in Qadr has benefits, from them are:
1 - Qadr is from the perfection of al-Eemaan, and al-Eemaan cannot be complete without it.
2 - It is from the perfection of Eemaan in Ruboobeeyah (Allaah’s Lordship), because the Qadr of Allaah is from His Actions.
3 - That a person returns all his matters to his Lord; because if he knows that everything is with Allaah’s Qada and His Qadr, then he will return to Allaah in repelling harm for the relief from it, and he will attribute prosperity to Allaah and he will know that this is from the excellence of Allaah upon him.
4 - That a person knows his own worth, and he does not become proud when doing good.
5 - That afflictions/problems become easier for Allaah’s slave; because if a person knows that it is from Allaah then his afflictions/problems is lessened.
As Allaah Ta’ala said:
وَمَن يُؤْمِن بِاللَّهِ يَهْدِ قَلْبَهُ ۚ
<<Whoever believes in Allaah then his heart is tranquil>> [Surah Taghabun: 11]
6 - Ascribing blessings to the one who renders that blessing, this is because if you did not believe in Qadr you would ascribe blessings to the one who takes care of giving those blessings, and this is present a lot amongst those who approach kings, leaders and ministers. If they receive from them what they want they say that the excellence was from them, and they forget the excellence of the Creator Subhanahu.
It is correct that it is obligatory upon a person to be thankful to the people, due to the statement of the Prophet ﷺ:
و من أتى إليكم معروفا فكافئوه
‘Whoever does a favour for you then compensate that person.’ [Saheehah no. 254 & Irwaa No. 1617], however it should be known that the foundation of all foundations is the excellence of Allaah – Azza wa Jal – which Allaah placed at the hand of this man.
7 - So that a person can know the wisdom of Allaah – Azza wa jal. This is because when he looks into this universe and what occurs in it from amazing, brilliant changes, then he comes to know about the Wisdom of Allaah – Azza wa Jal - and this is in contrast to the one who forgets al-Qada and al-Qadr then he does not get this benefit.
[Taken from ‘Sharh al-Aqeedah al-Wasiteeyah’ by Shaykh Muhammad bin Salih al-Uthaymeen 2/189-190. Translated by Abbas Abu Yahya. Posted on West London Dawah yahoogroup, August 2013]