Anything specific to write the essay on
I believe the answer is that 'only a person's good deeds remain with him or her in the afterlife'. It is important to be a good person and do good, and everything else is fleeting, it will disappear. But you will be awarded for your good deeds.
Labor-saving devices are inventions that reduce the time and effort needed to perform or complete a task. Farm equipment, home appliances and construction equipment are examples of mechanical inventions that save time and physical labor.