Translation:

56. But none will keep it in remembrance except as Allah wills: He is the Lord of Righteousness and the Lord of Forgiveness.

Notes (Tafseer)

5808. Righteousness as well as Forgiveness have their source in Allah's Will. Man's Righteousness has no meaning except in relation to the universal Will. For Taqwa see n. 26 to ii. 2. If we take the word here in the sense of "the fear of Allah", the translation would be: "He alone is worthy to be feared, and He alone is entitled to grant Forgiveness."