The contention of the verse “ mankind will return to God” can be proven through intelligent arguments and proofs because the society of mankind is like a caravan that began its journey from the darkness of the unseen and is journeying towards the ultimate light. God’s command and authority shadows this journey( It should be noted that these are the arguments after accepting the reality of Tawhid and the attributes of God).
In these verses the use of the word “Rabb” tells us that this will be a movement under the guidance of God systematically.
If the final point of this movement is death then such a movement is purposeless, meaningless and futile though we believe that this movement commanded by God is taking us to a better purpose.
After deep deliberations we see that the movement for perfection is done for reaching a better stage and the best stage is the presence of God. All movements are towards Him only so until man attains His closeness, does not reach the stage of His divine presence and enters the ranks of those close to Him , he will get no peace because he has not reached the final stage of movement. (Reflect)
We conclude from all this discussion that the development of man should not stop because it should continue in the same manner in the next world. The existence of movement and purpose are vivid proof on the issue of life after death.