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

 James Freeman Clarke

I think that this quote means that, even if you think that doing the right thing today will not have any effect in the future. You must still do the right thing. It may end up giving a positive effect after all. You should also be a good person and do the right thing because if you don’t it may also end up having a negative effect and end up ruining you.