Final answer:
All sins can be forgiven if the person repents sincerely, according to various religious beliefs, especially within Christianity. Martin Luther's view that repentance can lead to remission of sins without indulgences reflects this belief in Christianity. The concept of forgiveness in Islam similarly upholds that God may forgive sins based on His will.
Step-by-step explanation:
Based on the references provided, it appears that the question pertains to the concept of sin and blasphemy, and which of these can be forgiven. From a theological perspective, particularly within Christianity, it is generally understood that all sins can be forgiven if the person repents sincerely. This is reflected in various religious texts and beliefs. For example, in some Christian denominations, it is believed that only the sin against the Holy Spirit is unforgivable according to certain interpretations of the New Testament.
The reference to Martin Luther also highlights the belief that repentance grants remission of sins without the need for indulgence letters (as stated by Luther during the Protestant Reformation), which suggests that the forgiveness of sins is accessible to any repentant individual.
However, the concept of sin and the conditions for its forgiveness vary among different religions. The passage from the Quran suggests that God has the sovereign discretion to forgive or punish whom He wills. Therefore, within Islam, forgiveness of sin is also possible, but it is subject to God's will.
The excerpts provided show a complex and multi-faceted approach to the understanding of sin and forgiveness across different cultures and religious beliefs, underlining the universal theme of penitence as a pathway to forgiveness.