إِنَّا أَنْزَلْنَاهُ فِي لَيْلَةِ الْقَدْرِ وَمَا أَدْرَاكَ مَا لَيْلَةُ الْقَدْرِ لَيْلَةُ الْقَدْرِ خَيْرٌ مِنْ أَلْفِ شَهْرٍ تَنَزَّلُ الْمَلَائِكَةُ وَالرُّوحُ فِيهَا بِإِذْنِ رَبِّهِمْ مِنْ كُلِّ أَمْرٍ سَلَامٌ هِيَ حَتَّىٰ مَطْلَعِ الْفَجْرِ
Indeed, We sent the Qur’an down during the Night of Decree. And what can make you know what is the Night of Decree? The Night of Decree is better than a thousand months. The angels and the Spirit descend therein by permission of their Lord for every matter. Peace it is until the emergence of dawn.
Surah Al Qadr

Hz. Abu Huraira reported: The Messenger of Allah ^PBUH said:
‏إِذَا دَخَلَ شَهْرُ رَمَضَانَ فُتِّحَتْ أَبْوَابُ السَّمَاءِ وَغُلِّقَتْ أَبْوَابُ جَهَنَّمَ وَسُلْسِلَتِ الشَّيَاطِين‏
When the month of Ramadan begins, the gates of the heaven are opened, the gates of Hellfire are closed, and the devils are chained.
Source: Ṣaḥīḥ al-Bukhārī

Hazrath Imam Mahdi ^PBUH is narrated to have said that -“The nur (luminosity) of Iman (faith) is sufficient to understand the meaning of Quran, when it is being explained.”

Hazrath Ali -ul Murtuza ^Rz.said that:”Truth [may be] bitter, but it’s a result is sweet; falsehood appears to be sweet but it is poisonous in its effect.”