Before enlightenment you think, ‘I must chop wood’. You have an idea and you have an intention to carry it out. In your mind there is a sequence of thoughts: ‘It’s time to eat. I must cook some food. I need to cook my food. Therefore, I must chop some firewood.’ So your subsequent action is a product of thought, desire, and intention.
After enlightenment that intention to accomplish is no longer there. There is also the knowledge that there is no one who performs the activities that the body engages in. Wood gets chopped and water gets carried, but it has nothing to do with you. It just happens by itself. That is the difference.