The worst of people is the one who sells his next life for...
A person who does this is one who, from the point of view of his intellect, is a bad person since he himself is thinking bad thoughts (of the life of this world). From the point of view of his actions, he is also a bad person since he does bad deeds for the life of this world. In addition, from the point of view of his ambitions and aspirations, he is also bad since he has degraded his ambitions and goals!
Even worse than the one mentioned is the person who sells the life of the next world for the life of the transient world - however for other people! These sorts of people are not few in number and are people who say, “I am ready to sell my life of this world and the next world and everything which I possess (both materialistically and spiritually) in order to ensure that another person is comfortable in this life.” Truly, this is the pinnacle of stupidity and is the greatest loss for a person!
Sometimes a person will fall into the trap (mentioned in this tradition) and will open his eyes and see that he is now the physical manifestation of the first part of this tradition (that he has sold the life of the next life for the pleasures of this world). Slowly, he would realize that he has also become a manifestation of the second part of the tradition (that he has also sold the life of the next world for others around him and for them to be comfortable in this world)!