" It may make a difference to all eternity whether we do right or wrong today".

 This means that that if you are doing the right or the wrong its going to stay with you until the last day. For example if  robe in your live that is going to make you feel bad . You are going to think that why did you do that thing would be better is i did not do it. If you always CTR you will feel that you did the world a better place. You have to think before you do think. Think I'm I going to do better with this action I'm taking. And if you are ding wrong should you still do it. Just think about your actions before doing thing. Sometimes when you do them you feel bad and sorry for what you did. But if you choose the right today you will feel better. And live a better life.