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

James Freeman Clark

This quote means that no matter what you do whether it is wrong or right, it will make a difference for all eternity. For example, you are given the choice to go to college and get a degree or to drop out of high school and look for a job. Either of those decisions will make a difference for eternity. You are in control of that difference, so chose what type of difference it is that you want to make.