The self you are thinking about is not really the Self—it is not the True Self. The self you are thinking about is always changing. What you are experiencing is the mind. When the mind becomes one-pointed through the practice of Yoga, the Self experiences the Self. The ‘experience’ is the one-pointed mind. In other words, the ‘experience’ is the reflection of the Self in the mind which has become ‘atomic,’ i.e., one-pointed. The mind which is not one-pointed presents a distorted image (idea) of the Self. The distortion is removed by removing ego from the mind. ‘Removing ego from the mind’ means to stop thinking about your self.
Absence of all modifications of the mind comes from highest detachment. In the highest state of detachment, one experiences the Pure Self.