Sincerity is the freeing of one’s intentions from all impurities in order to come nearer to Allah. It is to ensure that the intentions behind all acts of worship and obedience to Allah are exclusively for His pleasure. It is the perpetual contemplation of the Creator, to the extent that one forgets the creation. Sincerity is a condition for Allah’s acceptance of good deeds performed in accordance with the sunnah of the Prophet, may Allah bless him and grant him peace. Allah has commanded this in the Qur’an:

And they have been commanded to worship only Allah, being sincere towards Him in their deen and true. “[98:5]