Problem: According to John Locke, there are two sources of ideas. The first source is [ understanding or judgmemt or sensation or reflection ] , through which we obtain such ideas as 'red', 'loud', 'hard', 'sweet', 'bitter', and so on. The second source is [understanding or judgment or sensation or reflection ] , through which we obtain ideas of our own mental operations, such as what thinking is, wondering, understanding, denying, and so on. Need Assignment Help?