The Bible says: Whatever your hand find to do, do it with all your might. If you do that, then you are doing your best. Everyone knows if they have done a job well or not. It doesn't matter what others opinions are about your own efforts. Only you can decipher wether you have accomplished a task well or not.
Some people try to slide through life with as little effort as possible (lazy), and their life bears this out. Others really put their heart into everything they do, and that is a testimony of the caliber of person they are also. If I need someone for a job, I know just who to call.......or not.