Why its a good idea to avoid laziness 

Man should eat from his toil is a bibilical command.This means one should be industrious to be successful.
Lazy farmers harvest little but those who work hard getv bountful product the lazy ones become jealous of the hard working ones and may steal from them and get arrested.
In the same way pupils who are never serious in class and don't pay attention to teachers or do homework will perform poorly in class.such pupils become jealous of those who work hard in class and excel in exams.
Hard work prepares you for a good life in future as you will achieve your dreams and become what you always wanted to be. If you want to become a doctor you must put alot of effort. It is such  determination and focus that has created young inventors.