From Mindfulness in Plain English by Bhante Henepola Gunaratana, Chapter 16 ("What's in It for You"):
... You search for that thing you call "me," but what you find is a physical body and how you have identified your sense of yourself with that bag of skin and bones. You search further and you find all manner of mental phenomena, such as emotions, thought patterns and opinions, and see how you identify the sense of yourself with each of them. You watch yourself becoming possessive, protective and defensive over these pitiful things and you see how crazy that is. You rummage furiously among these various items, constantly searching for yourself — physical matter, bodily sensations, feelings and emotions — it all keeps whirling round and round as you root through it, peering into every nook and cranny, endlessly hunting for "me."
You find nothing. In all that collection of mental hardware in this endless stream of ever-shifting experience all you can find is innumerable impersonal processes which have been caused and conditioned by previous processes. There is no static self to be found; it is all process. You find thoughts but no thinker, you find emotions and desires, but nobody doing them. The house itself is empty. There is nobody home.
Your whole view of self changes at this point. You begin to look upon yourself as if you were a newspaper photograph. When viewed with the naked eyes, the photograph you see is a definite image. When viewed through a magnifying glass, it all breaks down into an intricate configuration of dots. Similarly, under the penetrating gaze of mindfulness, the feeling of self, an "I" or '"being" anything, loses its solidity and dissolves. There comes a point in insight meditation where the three characteristics of existence — impermanence, unsatisfactoriness and selflessness — come rushing home with concept-searing force. You vividly experience the impermanence of life, the suffering nature of human existence, and the truth of no-self. You experience these things so graphically that you suddenly awake to the utter futility of craving, grasping and resistance. In the clarity and purity of this profound moment, our consciousness is transformed. The entity of self evaporates. All that is left is an infinity of interrelated nonpersonal phenomena, which are conditioned and ever changing. Craving is extinguished and a great burden is lifted. There remains only an effortless flow, without a trace of resistance or tension. There remains only peace, and blessed nibbana, the uncreated, is realized.