The Obedient and the Sinner are not equal
Allah says, `is the one who is like this equal to one who associates others in worship with Allah and sets up rivals to Him’ They are not equal before Allah, as He says:
(Not all of them are alike; a party of the People of the Scripture stand for the right, they recite the Ayat of Allah Ana’a Al-Layl, prostrating themselves (in prayer).) (3:113). And Allah says here:
(Is one who is obedient to Allah, Ana’a Al-Layl prostrating and standing) meaning, one who is humble and fears Allah when he prostrates and stands (in prayer). It was reported that Ibn Mas`ud, may Allah be pleased with him, said: “The obedient one is one who obeys Allah and His Messenger .” Ibn `Abbas, may Allah be pleased with him, Al-Hasan, As-Suddi and Ibn Zayd said, Ana’a Al-Layl means in the depths of the night.
(fearing the Hereafter and hoping for the mercy of his Lord.) means, in his worship he feels both fear and hope. Both are essential in worship, and fear should be stronger during one’s lifetime. Allah says:
(fearing the Hereafter and hoping for the mercy of his Lord. ) At the time of death, hope is uppermost, as Imam `Abd bin Humayd recorded in his Musnad from Anas, may Allah be pleased with him, who said, “The Messenger of Allah entered upon a man who was dying, and said to him,
(How do you feel) He said, `I am both afraid and hopeful.’ The Messenger of Allah said:
(These do not co-exist in a person’s heart at times such as this, but Allah will give him what he hopes for and protect him from that which he fears.)” This was recorded by At-Tirmidhi, An-Nasa’i in Al-Yawm wal-Laylah, and Ibn Majah from the Hadith of Yasar bin Hatim from Ja`far bin Sulayman. At-Tirmidhi said, “Gharib.” Imam Ahmad recorded that Tamim Ad-Dari, may Allah be pleased with him, said that the Messenger of Allah said:
(Whoever recites one hundred Ayat in one night, it will be recorded as if he prayed all night.) This was also recorded by An-Nasa’i in Al-Yawm wal-Laylah.
(Say: “Are those who know equal to those who know not”) means, is this one equal with the one who sets up rivals to Allah to mislead (men) from His path
(It is only men of understanding who will remember. ) means, the only one who will understand the difference between them is the one who has understanding. And Allah knows best.