Is there any way of knowing if a person has been forgiven by Allah, and if not then why so? Is there any sin that He doesn't forgive?

SinForgivenessGod (Allah)
Is there any way of knowing if a person has been forgiven by Allah, and if not then why so? Is there any sin that He doesn't forgive?
Sayed Mohammad Saleh Qazwini, Sayed Mohammad Saleh Qazwini has a BA from the University of Michigan and an MA from Wayne State University. He is a graduate of the Islamic Seminary of Qom, Iran. Answered 6 years ago

Allah has promised to forgive all sins with the exception of associating a partner with Him (shirk). The only condition for a sin to be forgiven is sincerity. If a person is sincere in their repentance, meaning that they do not go back to the same sin, then that is a sign that Allah has forgiven them. Allah knows best.