How can a Muslim attain khushu' (humility) in his prayer in the manner required by the Shari'ah?

Question:
How can a Muslim attain khushu' (humility) in his prayer in the manner required by the Shari'ah, such that he does not think of any worldly matter whatsoever during his prayer? Then you say about yourself, "I try to be humble in my prayer, but I am unable to control my thoughts. I find that sometimes my mind is far from the prayer, occupied with other things. I wish I could feel the pleasure of prayer, as the Messenger of Allah (peace and blessings be upon him) used to say, 'O Bilal, give us relief through the prayer.' And just like our righteous predecessors, one of whom would be praying when a wall would fall beside him, yet he would not feel it due to the intensity of his absorption in the prayer. How can I be like that? May Allah reward you with good.

Answer:
Yes, khushu' (humility) in prayer is a required matter, and it is the spirit of the prayers. There are causes for khushu', among which is turning to Allah (Glorified and Exalted is He) in prayer, and keeping in mind the greatness of Allah (Glorified and Exalted is He). Among them is remembering the promise and the warning in prayer: a person remembers the noble promise from Allah (Glorified and Exalted is He) of the great reward and abundant recompense for whoever performs the prayer, and the warning for whoever disobeys Allah (Glorified and Exalted is He). He remembers this, and he remembers this, and he becomes humble out of desire and fear: desire for the reward and fear of the punishment, while keeping in mind the greatness of the Lord (Glorified and Exalted is He). He keeps in mind the greatness of the One before whom he is standing and with whom he is conversing through his words. To Allah belongs the highest example: if a person were to stand before an emir or a king, what would his state be in terms of awe and sensitivity? He would fear that this emir or this king might criticize his standing or his conduct. So Allah (Mighty and Majestic) is more deserving and more entitled to be magnified and feared, because you are standing before Allah (Glorified and Exalted is He). So Allah (Mighty and Majestic) turns His face toward the face of the one praying, as is authentic in the hadith, before the face of the one praying, so , to the end of what came in the hadith.
And in the hadith, it is also narrated from the Prophet (peace and blessings be upon him) that the servant stands before Allah (Mighty and Majestic), and Allah turns His face toward the face of the one praying. So when you pray, do not turn your heads. This means do not turn your hearts, and also do not turn your necks, heads, or bodies, deviating from the direction of the qiblah. And it is better not to deviate with one's heart from Allah (Glorified and Exalted is He) either.
Among the causes of khushu' in prayer is seeking refuge with Allah from Shaytan at the beginning of it, with presence of heart. Among the causes of khushu' in prayer is reflecting upon the Qur'an that one recites in prayer, and reflecting upon the words and actions one performs in prayer, such as takbir, standing, sitting, ruku', and sujud. One reflects upon these things, and that he does this to magnify Allah (Glorified and Exalted is He) and to obey Him. Also, one should not enter prayer with a disturbed mind due to any cause, whether due to the presence of food and a need for food, or due to being occupied with the presence of the two excretions, urine and feces, or due to severe cold or severe heat. For these disturb his prayer. Therefore, the Prophet (peace and blessings be upon him) said, "There is no prayer in the presence of food, and while the two excretions are urging him," meaning urine and feces. These are among the causes of khushu'. Among the causes of khushu' is also making one's food pure by eating from what is halal and avoiding what is haram, because this is among the causes of khushu' in prayer. The one who eats haram and earns haram, he does not find the pleasure of khushu' before Allah (Glorified and Exalted is He). Yes.