In The Name of Allaah, The Most Merciful The Bestower of Mercy
Allaah [The Most High] said:
وَاسْتَعِينُوا بِالصَّبْرِ وَالصَّلَاةِ ۚ وَإِنَّهَا لَكَبِيرَةٌ إِلَّا عَلَى الْخَاشِعِينَ
الَّذِينَ يَظُنُّونَ أَنَّهُم مُّلَاقُو رَبِّهِمْ وَأَنَّهُمْ إِلَيْهِ رَاجِعُونَ
‘’And seek help in patience and prayer, and truly it is extremely heavy and hard except for those who humble in the presence of their Lord.” They are those who are certain that they are going to meet their Lord, and that to Him they are going to return’’ [Al-Baqarah: Ayah: 45-46]
Indeed, it [i.e. seeking help in patience and prayer] is heavy upon other than those who are humble before Allaah, because the hearts [of those who are not humble before Allaah] are devoid of love of Allaah, exaltation of Him, glorification of Him and humility in His presence. They have little desire in asking Allaah for the good things of the worldly and the afterlife, and [they have little desire] in seeking His protection from the evil affairs of this life and the next. That is because the presence of the slave’s heart and mind in the prayer, being humble within [the prayer], seeking for perfection in it, disconnecting his mind and heart from everything whilst in the prayer, and striving with great effort to establish and fulfil it, then [all of this takes place] in accordance with the strength of his fervent desire [to please Allaah, hoping for Allaah’s reward and fearing Allaah’s punishment].
[Source: Badaa’i-u At-Tafseer Al-Jaami Limaa Fassarahu Al-Imaam Ibnu Qayyim Al-Jawziyyah: vol: 1 page: 125. Slightly paraphrased]