The Messenger of Allah ‎ﷺ is reported to have said: 

Wondrous is the affair of the believer for there is good for him in every matter and this is not the case with anyone except the believer. If he is happy, then he thanks Allah and thus there is good for him, and if he is harmed, then he shows patience and thus there is good for him.

Source: Sahih Muslim 2999, Grade: Sahih

The early jurists and scholars such as Imaams Al-Shafiʻi, Aḥmad Ibn Hanbal, Abu Dawud, Al-Daraqutni, and Al-Tirmidhi agreed that this hadith encompasses one-third of Islam.

وَإِذَا قِيلَ لَهُمُ اتَّبِعُوا مَا أَنزَلَ اللَّهُ قَالُوا بَلْ نَتَّبِعُ مَا أَلْفَيْنَا عَلَيْهِ آبَاءَنَا ۗ أَوَلَوْ كَانَ آبَاؤُهُمْ لَا يَعْقِلُونَ شَيْئًا وَلَا يَهْتَدُونَ

And when it is said to them, "Follow what Allah has revealed," they say, "Rather, we will follow that which we found our fathers doing." Even though their fathers understood nothing, nor were they guided? (2:170)

Mindfulness in Islam (al-muraqabah) is a conscious state of comprehensive awareness of Allah and our inner states in relation to Him. In its complete form, it is the highest spiritual state attainable—the perfect realization of excellence in faith (al-ihsan). Modern science has demonstrated the efficacy of mindfulness exercises in procuring a number of health and wellness benefits, even in a non-religious context. These insights can be critically synthesised with Islam’s traditional concepts of meditation to produce practical contemporary techniques that cultivate Islamic mindfulness, enhance worship, and enrich our quality of life.

Abdullah ibn Amr reported: The Messenger of Allah, peace and blessings be upon him, said,

“By the One in whose hand is the soul of Muhammad, the parable of the believer is that of a piece of gold. Its owner blows upon it, yet it never changes or diminishes.

Source: Musnad Aḥmad 6833

To be like the rock that the waves keep crashing over. It stands, unmoved and the raging of the sea still around it.

— Marcus Aurelius, The Meditations

I have discovered that all the unhappiness of men arises from one single fact, that they cannot stay quietly in their own room.

 — Blaise Pascal

Imam Al-Ghazali writes:

“Indeed, the number of months with Allah is twelve [lunar] months in the register of Allah [from] the day He created the heavens and the earth; of these, four are sacred.. ”

(Surah At-Tawbah, Verse 36)

*The Prophet Muhammed (peace be upon him) is reported to have said:

(Sahih Al Bukhari)