question #2 Sahih al-Bukhari 2008, Book 31, Hadith 1 : How does sincere faith and hope for reward from Allah influence the forgiveness of sins?

I heard Allah’s Messenger (ﷺ) saying regarding Ramadan, “Whoever prayed at night in it (the month of
Ramadan) out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be
forgiven.”