Working hard or working smart.

I always heard that people say that do work hard but my point is why not work smart .
in my case whenever I need to go to early my home and I need to finish my work before 5.00pm then I will take a code from Perl cookbook or any good coding site where I can get relevant data and putting my name on that and using as a my code .
I did not understand that what is the harm to use above idea.

let me explain ,when somebody has invent the wheel then why should I re-invent it.
use the code hack the code and enjoy the life .The combination of Perl + life and amazing.
you will everything in life and vice-versa.
any way I want to write more and more and I will write again.