question #3 Sahih Muslim 760a, Book 6, Hadith 209 : What is the significance of seeking reward from Allah in acts of worship like fasting and prayer?

He who observed the fasts of Ramadan with faith and seeking reward (from Allah), all his previous sins would be forgiven, and he who observed prayer on Lailat-ul- Qadr with faith and seeking reward (from Allah), all his previous sins would be forgiven.