Among those deceived people may be one who thinks that his good deeds are more than his sins, because he does not pay attention to his bad deeds or check on his sins, but if he does a good deed he remembers it and relies on it.
This is like the one who seeks Allah’s forgiveness with his tongue (that is, by words only), and glorifies Allah by saying “subhan Allah” one hundred times a day, then he backbites about the Muslims and slanders their honor, and speaks all day long about things that are not pleasing to Allah. This person is always thinking about the virtues of his saying “subhan Allah” and saying “la ilaha ila Allah” but he pays no attention to what has been reported concerning those who backbite, tell lies, and slander others, or commit other sins of the tongue. They are completely deceived.
–ibn al-Qayyim (rahimahullah)
May Allah protect us from being deceived by our deeds. Ameen.