The sincere hearts and the pious supplications are soldiers

قال شيخ الإسلام ابن تيمية-رحمه الله-: "القلوب الصادقة والأدعية الصالحة هي العسكر الذي لا يغلب". مجموع الفتاوى (28 / 644)
‎"The sincere hearts and the pious supplications are soldiers which can never be defeated" 
Ibn Taymiyyah rahimahullah

It is narrated from Ibn Mas'ud (radhiallahu `anhu) that the Messenger of Allah (sallallahu `alayhi wa sallam) said:
'Read the Qur'an as you have been taught, for indeed those who came before you were destroyed only because of their differing with their Prophets.'
[Reported by Ahmad]


It is narrated from 'Isma ibn Malik (radhiallahu`anhu) that the Messenger of Allah (sallallahu `alayhi wa sallam) said:
'If the Qur'an is gathered into a single vessel (i.e. the heart), Allah will never burn it in the Fire.'
[Reported by al-Bayhaqi]

"Guard against having a bad opinion of people"
Al-Hasan Al-Basree

If a man spreads his secret with his own tongue, then he is a fool, if blame to others he attests; If his own breast is too narrow to conceal his own secret, the breast of another is even more compressed." -Imam ash-Shafi'ee

‎"The one who memorizes the Qur’an must be known by the nights when people are sleeping. By his days when people are eating. By his sadness when people are rejoicing. By his weeping when people are laughing. By his silence when people are indulged in vain talk. And by his humility when people are boasting" Abdullah ibn Mas'ud"
An- Nawawi collected in At-Tibyaan.Abu Bakr As-Siddiq seminar series No A-13

Bilal bin Sa’d has said:
أخ لك كلما لقيك ذكرك بحظك من الله خير لك من أخ كلما لقيك وضع في كفك دينارًا
“A brother who remembers you of Allaah when you meet him, is better than a friend who places a dinar in your hand every time you meet him”.
["Hilyatul Awliyaa", 5/225].

Al-Hasan al-Basri said,
“He who has no manners has no knowledge; he who has no patience has no Religion (din); and he who has no God-consciousness has no closeness to Allah.”