"Nay, but you love the fleeting life and you neglect the Hereafter." That is: You do not believe that it is coming. He says this to the polytheists.
﴿كَلَّا بَلْ تُحِبُّونَ الْعَاجِلَةَ وَتَذَرُونَ الْآخِرَة﴾ أَيْ: لَا تُؤْمِنُونَ أَنَّهَا جَائِيَةٌ، يَقُوله للْمُشْرِكين