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

James Freeman Clarke 

    What this means is that your decisions in the present may affect you in the future. It may even affect you for the rest of your life. For example if in the present you do good. Your future will be good also. Like if you get good grades. In the future, your sure to get into a good college or university. If you do bad, then you'll do bad for all eternity. You get bad grades, and that will affect you. You need to choose what is right for you.