I think it means that you should live your life better than the first time. As if you were given a second chance. So all the things you did wrong in your first life you should try to make up or fix in the second one. I think it is to try and tell us that we should make the most of this life so we won't need a second one to fix our wrong-doings. It means to live life and try not to cause more wrong than there already is. I hope this helps!