Shaykhul-Islaam Ibn Taymiyyah (may Allah have mercy upon him) stated:
I have an expansive chest towards the one who opposes me. Indeed if he were to transgress the boundaries of Allah regarding me by declaring me to be a kaafir or a faasiq (criminal), or by lying upon me or dealing with me in a manner of pre-Islamic fanaticism, I will not transgress the boundaries of Allah regarding him. Rather I will be accurate in that which I say and do. I will weigh it with the scales of justice and make it a follower of the Book which Allah has sent down, made a guidance for mankind and a judge for that which they differed in.
Shaykh Muhammad Ramzan al-Hajiri said:
It was said to Hassan al-Basri: O Aba Sai’id, A man sins then he repents, then he sins, then he repents, Until he dies. He said, I do not know this (being anything) but (from) the characteristics of the believers.
[Al- Hilayah, vol 2 pg. 315]
Shaykh al-Islam Ibn Taymiyah:
“The sincere hearts and the pious supplications are soldiers which can never be defeated.”
(Majmo Al Fatawa 644/28)