The absence of evidence is not evidence of the absence. Some people assume that if something is beyond their ability to see, hear, taste, touch, or smell, it is simply doesn’t exist. Others believe that it may exist but that they simply are not able to grasp it because they are limited by their senses. Often the latter group searches for ways to stretch their ability to know. For example, there are scientific instruments that allow us to see what was previously hidden. Even so, the most refined instrument we possess is self-knowledge. As we enlarge that capability we magnify our capacity to become more effective at everything else we do. Self-knowledge is the master key to how we make use of all other inventions. Albert Einstein said: “The most beautiful emotion we can experience is the mysterious.” He was clearly in the group that stretched their ability to know.