Within this world, the most powerful obscuration or negativity is known as the grasping of self, the "I", or the ego.
When one just thinks of "I" and has that kind of strong ego and pride, then within that kind of mind-stream it is very difficult to have these dharma teachings and practices. Pride or the ego is like an iron ball which pulls us down.
If we carefully investigate ourselves, we will not find an "I" existing in reality. We think, "I am," and "He is," or "She is," but when we examine truly, these are not existing in an absolute sense. For example, we may think of our body as "I," but when we investigate we can see that the body is not the "I." The "I" feels happy, the "I" suffers, the "I" has this pain and sickness, and then the "I" dies. But when at death the five aggregates of our physical bodies die, still our external body is there, but it no longer has all those kinds of experiences of happiness or pain. For example, when the dead body burns in the fire, it does not feel the heat at all. When it is buried under the ground, there is not any kind of feeling either. Even when it is eaten by dogs and vultures, there is no pain at all. When death happens, all the pains and sufferings associated with the body are no longer there.
Even right now if we try to find this "I" within our body, from top to bottom, we cannot really find it. When we investigate, asking: Is the head the "I?" Is the eye the "I?" Is the nose the "I?" Is the chest the "I?" We cannot find in any part what we call the "I." There is no way we can find our mind, our "I," there.
In the relative bodily existence, it is our mind's grasping of subject and object through which we think there is this "I" and through which we experience things. It is merely created by the conceptual mind. Verbal speech, also, when we investigate and divide past, present and future, then we cannot find what is called speech. It is just in our mind.
By His Holiness Penor Rinpoche