Do sins invalidate the good deeds a person performs?

Question:
The questioner says: I am a committed young man, praise be to Allah. I keep up the prayers and the voluntary ones, but I have some sins. Do these sins nullify my deeds, as mentioned in the hadith where a person is brought with deeds like mountains, and Allah makes them scattered dust?

Answer:
This applies to the disbeliever; the disbeliever and the one who associates partners with Allah have their deeds nullified, even if they do good deeds, if they disbelieve or associate partners with Allah, then Allah nullifies their deeds. As for the believer, these sins diminish his faith, but they do not make him a disbeliever, nor do they nullify his deeds. Sins do not nullify deeds except for showing off (riya'), which nullifies the deed it is mixed with. So the believer’s deeds are not nullified, but he is exposed to punishment; if Allah wills, He will punish him, and if He wills, He will forgive him. As for the rest of his deeds, they are not nullified because he is a believer who affirms the oneness of Allah, and the sins diminish the faith. He is under Allah’s will; if Allah wills, He will forgive them for him, and if He wills, He will punish him. Yes.