Although it’s already been alluded to in the answers above, I think it deserves recognition by name. Imagination. Imagination that’s free from the fetters of convention and personal deterrents, as mentioned in the other comments, including the fear of stepping beyond the comfortable as well, but also partnered with reality. We can get our house in order, but not really see the world until we step out the door. Although it generally arises on it’s own, after taking the necessary precipitating steps, I think it deserves mentioning. Imagination is a wonderful tool when used properly.