Surah Al An'aam Notes (26-30)

(26) And they prevent [others] from him and are [themselves] remote from him. And they do not destroy except themselves, but they perceive [it] not.

(27)If you could but see when they are made to stand before the Fire and will say, "Oh, would that we could be returned [to life on earth] and not deny the signs of our Lord and be among the believers."

(28)But what they concealed before has [now] appeared to them. And even if they were returned, they would return to that which they were forbidden; and indeed, they are liars.

(29)And they say, "There is none but our worldly life, and we will not be resurrected."

(30)If you could but see when they will be made to stand before their Lord. He will say, "Is this not the truth?" They will say, "Yes, by our Lord." He will [then] say, "So taste the punishment because you used to disbelieve."

(6:26) The disbelievers discourage people from following the truth, believing in Muhammad and obeying the Quran. They thus combine both evil acts, for they neither benefit themselves, not let others benefit from the Prophet.
Muhammad bin Al Hanafiyyah said, "The disbelievers of Quraish used to refrain from meeting Muhammad and they discouraged people from coming to him. They destroy themselves by committing this evil action, and its harm will only touch them. Yet, they do not perceive this fact.

Wishes and hopes do not help one when he sees the torment.
(6:27) Allah mentions the condition of the disbelievers when they are made to stand before the Fire on the Day of Resurrection and witness its chains and restraints, along with seeing the horrible, momentous conditions in the Fire with their own eyes. 

They wish that they would be sent back to the life of the world so that they could perform righteous deeds, refrain from disbelieving in the Ayah of their Lord and be among the believers.

(6:28) The disbelief, denial and rebellion that they used to hide in their hearts will then be uncovered, even though they will try to hide this fact in this life and the Hereafter.

(6:29) The disbelievers deny the Day of Resurrection and they strongly believe that there is nothing beyond this world and no accountability for their deeds.

(6:30) If you could but see when they will be made to stand before their Lord. He will say, "Is this not the truth?" They will say, "Yes, by our Lord." He will [then] say, "So taste the punishment because you used to disbelieve."