Why?
A country sends an ambassador to another country to improve bilateral relations, enhance trade ties, and so on. Suppose the ambassador becomes engrossed in sightseeing and enjoying the local cuisine and culture, at the cost of his official duties, while the whole time on his government’s expenditure. What do you think will happen to him when he returns to his country?
Similarly, if we don't fulfill the duties we were sent to earth for, then we will not be appreciated by Allah (subhana wa ta’ala) when we return to Him. That is why the Prophet (sal Allahu alaihi wa sallam) mentioned what he did about the worst of his Ummah – because, their focus is not on fulfilling the responsibilities of the office they were entrusted with, but on enjoying themselves.
