Utter Joy

وَاسْتَعِينُوا بِالصَّبْرِ وَالصَّلَاةِ ۚ وَإِنَّهَا لَكَبِيرَةٌ إِلَّا عَلَى الْخَاشِعِينَ
الَّذِينَ يَظُنُّونَ أَنَّهُم مُّلَاقُو رَبِّهِمْ وَأَنَّهُمْ إِلَيْهِ رَاجِعُونَ

"And seek help in patience and prayer, and verily that is burdensome on all but the submissive ones, those who believe that they will meet their Lord, and that they will be returning to him." 

Surah al-Baqara [2:45-46]

The Prophet, sallAllaahu 'alayhi wa salam, has said:

"And utter joy has been made for me within the prayer."

[Nasaa'i, Ahmad]