It is not enough that we perceive things as not being self.
Why?
The Buddha warned:
"As he attends inappropriately in this way, one of six kinds
of view arises in him: The view I have a self arises in him as
true & established, or the view I have no self... or
the view It is precisely by means of self that I perceive
self... or the view It is precisely by means of self that
I perceive not-self... or the view It is precisely by
means of not-self that I perceive self arises in him as true
& established, or else he has a view like this: This very
self of mine — the knower that is sensitive here & there to the
ripening of good & bad actions — is the self of mine that is
constant, everlasting, eternal, not subject to change, and will
stay just as it is for eternity. This is called a thicket of
views, a wilderness of views, a contortion of views, a writhing of
views, a fetter of views. Bound by a fetter of views, the
uninstructed run-of-the-mill person is not freed from birth, aging,
& death, from sorrow, lamentation, pain, distress, &
despair. He is not freed, I tell you, from suffering &
stress."
All these views of existence and non-existence presumes there is
a true self, an 'I', that can be pinned down as a truth or
reality... in order to have or not have existence.
Furthermore, it can be that they think they are an ultimate self
and observer, such that all things they observe are outside and not
them - all things are not-self, and so they reject things they see
as not-self while clinging to an ultimate self which is the
ultimate observer of things.
This is what the Buddha calls the false view of "the
view It is precisely by means of self that I perceive
not-self.."
Clinging to false views as such, we don't see the nature of
reality.
Seeing the nature of reality, we realize the Emptiness of
Self... no self as such can be found, pinned down as a truth or
reality inside or outside of the five skandhas. There is no agent,
perceiver, doer, controller. This is the teaching of Buddha.