“When you spend significant amounts of time with someone they offer constant feedback, becoming part of the patterning of your brain. In other words, part of you. But I take your point -- constant feedback is not always deep feedback. A good measure of how much of you they've become is your level of distress when they're gone. If they form a large measure of your patterning, then you'll experience a major culling of the self. That's what's known as grief.”