Islamic quote on heart
قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:
الشيخُ يضعُفُ جسمُهُ؛ وقَلْبُهُ شابٌّ على حُبِّ اثنتينِ ؛ طولُ الحياةِ، وحبُّ المالِ
صحيح الجامع ٣٧٤٩ | الشيخ الألباني رحمه الله | صحيح
The Messenger of Allāh صَلَّى اللّٰهُ عَلَيْهِ وَسَلَّمَ said:
“A man becomes old and his body becomes weak, but his heart remains young for two [reasons] which he loves: a long life and love of wealth.”
Islamic Quote on Mother and Mercy of Allah
Saheeh al-Jāmi’ 3749 | Shaykh al-Albāni رحمه الله | Hasan
قال شيخ الإسلام ابن تيمية رحمه الله:
فبين أن الله أرحم بعباده من أرحم الوالدات بولدها. فإنه من جعلها رحيمة أرحم منها.
مجموعة الفتاوى لشيخ الاسلام ابن تيميه ١٦/٤٤٨
Shaykh ul-Islām Ibn Taymiyyah [may Allāh have mercy on him] said:
“Allāh is more merciful to His servants than the most merciful of mothers is to her child, for indeed He [Allāh] is the One who made her, the mother merciful, therefore He is more merciful than her.”
Majmū al-Fatāwa 16/448 | Shaykh ul-Islām ibn Taymiyyah [may Allāh have mercy on him]
Islamic quote on Fear
Al-Imām ibn Rajab [may Allāh have mercy on him] said:
“Some of the Pious Predecessors and Successors said: ‘The one who fears Allāh is not he who weeps and his eyes overflow with tears. Certainly, the one who fears Allāh is he who abandons [his] desires which are unlawful [unto him], whilst being able to perform it [i.e. the unlawful act(s)]. The greatest reward is for he who obeys Allāh in private.”
Majmū’ Rasāʼil, 1/163 | Al-Imām ibn Rajab [may Allāh have mercy on him]
Reference: Authentic Quotes
Quotes: Allah is most merciful than mother, fear Allah in private, youthfulness of heart, young heart, body weak but heart is young