يَا أَيَّتُهَا النَّفْسُ الْمُطْمَئِنَّةُ ۝ ارْجِعِي إِلَىٰ رَبِّكِ رَاضِيَةً مَّرْضِيَّةً ۝ فَادْخُلِي فِي عِبَادِي ۝ وَادْخُلِي جَنَّتِي

The other type of person is one who would bow down before God and thank Him when he received something, and when things were taken away from him, he would once again bow down before God and express his humility. It is the second type of person who has been called the contented soul or an-nafs al-mutmainnah. The position of the contented soul is attained by one who ponders over God’s signs in the universe; who derives spiritual nourishment, learns lessons and receives guidance from historical events; who proves that if there is a clash between the self and the Truth, he will ignore the self and accept the Truth; who, after once accepting the Truth, never renounces it, whatever the cost.

— Source: Tazkirul Quran (Maulana Wahiduddin Khan) via Quran.com (89:27)