An Internal World
Excerpt from "The Brain's Ability to Look Within: A Secret to Well-Being," by Emma M. Seppala, Feeling It: Psychology Today Blog, December 10, 2012:
Most of us prioritize externally oriented attention. When we think of attention, we often think of focusing on something outside of ourselves. We "pay attention" to work, the TV, our partner, traffic, or anything that engages our senses. However, a whole other world exists that most of us are far less aware of: 
an internal world, with its varied landscape of emotions, feelings, and sensations. Yet it is often the internal world that determines whether we are having a good day or not, whether we are happy or unhappy. That’s why we can feel angry despite beautiful surroundings or feel perfectly happy despite being stuck in traffics. For this reason perhaps, this newly discovered pathway of attention may hold the key to greater well-being.
Although this internal world of feelings and sensations dominates perception in babies, it becomes increasingly foreign and distant as we learn to prioritize the outside world. Because we don’t pay as much attention to our internal world, it often takes us by surprise. We often only tune into our body when it rings an alarm bell –– that we’re extremely thirsty, hungry, exhausted or in pain. A flush of anger, a choked up feeling of sadness, or the warmth of love in our chest often appear to come out of the blue.