A detailed digital illustration representing Matthew 15:18-20. In the center, visualize a human heart as the source of various symbolic elements to depict evil thoughts such as a dark cloud for slander, broken pair of glasses for false testimony, a black feather for theft, a cracked mirror for adultery, and a shadowy figure with a knife for murder. In the background, have a person with unwashed hands eating a fruit, demonstrating that it doesn't defile them. The whole scenario should evoke an introspective and moral tone, while keeping the artistry symbolic and ethereal.