The reality of this dunya.

 The reality of this dunya. 

Allah says in Quran, 

Al-Hadid 57:20

Know that the life of this world is but amusement and diversion and adornment and boasting to one another and competition in increase of wealth and children - like the example of a rain whose [resulting] plant growth pleases the tillers; then it dries and you see it turned yellow; then it becomes [scattered] debris. And in the Hereafter is severe punishment and forgiveness from Allāh and approval. And what is the worldly life except the enjoyment of delusion.

Just lets look at how Allah described the dunya like a seed one plant in the soil and it grows into seedlings and continue to grow until it becomes a plant and bear fruits so sweet and attractive 

It continues until it turns old and the leaves turns yellow and stand to fall down again and later new leaves form and fruit again and falls and continue like that 

This is the dunya, it has no permanent enjoyment but allusions and delusion we are living until death comes for us to see the reality of life. 

The messenger of Allah PBUH said in his hadith, 

Narrated Abu Sa`id Al-Khudri:

Allah's Messenger (ﷺ) said, "The thing I am afraid of most for your sake, is the worldly blessings which Allah will bring forth to you." It was said, "What are the blessings of this world?" The Prophet (ﷺ) said, "The pleasures of the world." A man said, "Can the good bring forth evil?" The Prophet (ﷺ) kept quiet for a while till we thought that he was being inspired divinely. Then he started removing the sweat from his forehead and said," Where is the questioner?" That man said, "I (am present)." Abu Sa`id added: We thanked the man when the result (of his question) was such. The Prophet (ﷺ) said, "Good never brings forth but good. This wealth (of the world) is (like) green and sweet (fruit), and all the vegetation which grows on the bankof a stream either kills or nearly kills the animal that eats too much of it, except the animal that eats the Khadira (a kind of vegetation). Such an animal eats till its stomach is full and then it faces the sun and starts ruminating and then it passes out dung and urine and goes to eat again. This worldly wealth is (like) sweet (fruit), and if a person earns it (the wealth) in a legal way and spends it properly, then it is an excellent helper, and whoever earns it in an illegal way, he will be like the one who eats but is never satisfied."

Sahih al-Bukhari 6427