The reward is given according to deeds.

(… ثَوَابَ الدُّنْيَا …) (…the reward of this world …): It is what Allah (swt) gives the man of health, poverty and money and the reward of the Hereafter is Allah’s satisfaction and the Paradise.

Whoever wants the reward of this world, let him do a righteous deed, for Allah (swt) created things that work for you, and He created things that work through you. Among the things that work for you are the sun, the moon, the air, the night and the day, the clouds, the rain, the vegetation and others, and they are for the believers and the unbelievers. There are things that work by your movement and they are the basis of progress, development and civilization. It is true that Allah (swt) created for you the sun and the heat gives you light and warmth, but if you study and learn physics and build laboratories, you can use it as a source for generating electrical energy. So, Allah (swt) asks man to take reasons in this worldly life, then Allah (swt) rewards him regardless of whether he is a believer or a non-believer. For example, we may ask why Western countries are advanced while they are not believers and do such and such? Because the things that Allah (swt) created work for them because of their movement and work, this is the reward of this world.

Allah (swt) in this verse wants to say to you that it is the best for you to gain the reward of this life and the hereafter; that is if you benefit from the things He (swt) has created for you, then you will gain the reward of this life and when are committed to His orders and do good with His creation, then you will be rewarded in the hereafter.

( وَكَانَ اللَّهُ سَمِيعًا بَصِيرًا … ) (…And ever is Allah Hearing and Seeing): This is because the matter is related to the work entrusted to man and the effort he puts in. Therefore, O man, rest assured that Allah (swt) is hearing and seeing all the work that you do.