Anatta: Non-Self

Probably the most important "thing" in meditation and it's ultimate goal is insight in the fact that there is no Self.
You cannot slowly gain this insight; you see it or you don't see it.
If you have seen it once it is not sure you will hold on to the insight. But the more you have experienced it, the easier it becomes to recall and to reproduce the experience.
It is a bit like the following picture:

What do you see first? The old lady? Then the illusion of Self is like the old lady.
If you see the young lady first then the illusion of self is like the young lady.

The experience of non-self is as nearby as the picture you first do not see in the drawing above.

It is not a matter of going deep within.

It is right there, on the surface, clear as anything.

Once the illusion of Self is gone we see things as they really are, not filtered by our conceptual views.

The experience of Non-Self is an experience that all great spiritual thinkers have mentioned. From the Buddha to Christ, from Eckhart Tolle to Byron Kathy...

Once experienced it can never be forgotten.

The best way to quickly experience it is to take your own consciousness as the subject of observation. Ask yourself What Am I. Am I my body? The answer will be no. Am I my thoughts? The answer will also be no. Then What/Where am I? Try to find yourself as the person who is aware of this process of thinking and you will find consciousness, but you won't find an "I".

In Buddhism Non-Self is called Anatta.
The Buddha says we are all but 5 aggregates.
Of the 5 aggregates later...