Hume Origin of Ideas

Hume begins his Section II by stating there is a significant difference between the perceptions of the mind, and when a memory is recalled, or a sensation is anticpated. He says these faculties may mimic or copy the perceptions of the senses; but they never can entirely reach the force and vivacity of the original sentitment. The most lively thought is still inferior to the dullest sensation. Our ideas do not require any metaphysical head to distinguish these perceptions. I think here Hume is beginning to argue against the soul even existing. He distinguishes our perceptions into two parts: ideas and impressions. Ideas are the abstract thoughts of our minds, and impressions are the effects of our senses. He goes on to say that humans do not create any original ideas. Obscure images are made up of putting images we have witnessed together. And abstract ideas come from degrees of other abstract ideas. He argues that there could be one contradictory situation to this philosophy, where a person who has seen every shade of blue except one is shown all the shades of blue and can realize that there is a shade missing within the gradation of the colors. I do not see how this is different than his argument for degrees of abstract ideas, where God is an idea of the greatest goodness or highest intelligence. This blue that is missing can be easily understood by anyone who has never seen it it they notice the difference in the other blues. It is like discovering an idea serendipitously, then using not only the knew knowledge, but also the new way to obtain knowledge. He ends this section by saying all abstract ideas are faint and obscure, and all impressions are strong and vivid. He says it does not take any meta-head to make these distinctions, but if the body is capable of feeling these impressions so vividly at any given time, why can't it feel it the same way at any other time?