So, I believe that there are two natures, one natural and one supernatural. Aren’t you on your way to getting back to that rational trick? Maybe, but I still believe the rock will fall to the ground every time I release it. Once you have tasted flight you will forever walk the earth poster. You are too much! I’m not overdoing it, Sophie. For a philosopher, it is never wrong to ask questions. Perhaps we are getting closer to the pivotal point of Hume’s philosophy. Please tell me how I can be so sure that the rock will always fall to the ground.