David Hume was an English philosopher who lived during the 18th century. He believed that all ideas come from sense impressions. He also thought that every idea had its own reality, that we could never know if two ideas were exactly alike or not since empirical knowledge does not render us to differentiate between something that has happened and a cause-and-effect relationship.
David Hume wasn’t convinced that all of our knowledge came from experience. He believed that we could base conclusions on evidence other than direct perception, such as reasoning. He thought that we could never know anything with absolute certainty since we can never observe everything. For example, if you look at a spinning globe and notice a certain movement, then I may think that this movement resulted from the rotation of the earth. However, I might have missed that the moon was moving at the same time, causing my eye to mistake the two movements for one. If we could somehow measure both movements simultaneously, we would see that they were actually different. So, while we may conclude that the earth is rotating due to its movement, we cannot say that the earth caused the movement since we cannot prove that the cause preceded the effect.
