What does the phrase 'I myself” (line 14) mean?

Diection:

            The true reality of life can be known only when we maintain
            a balance between the mathematical elements of nature,
            on the one hand, and consciousness and will, on the other.
            There are two things in nature we have no doubt about; our
(5)        existence and the outside world. But there is something
            which makes us aware of these two elements and that is
            our thought. Whatever we feel, our conclusions, our fears,
            and aspirations, all revolve around our thinking. Our flesh
            and bones cannot perceive things in nature. It is the capability
(10)      of our thoughts alone. Even a physically disabled man with a
            sane mind gets rational thoughts. So there is some great
            power that picks impressions from surroundings, concludes
            ideas, and gives reasoning and judgment. And that power
            is the power of thinking. This is real “I myself”. This ‘I myself’
(15)      has an existence apart from its physical reality. It is the
            real self or person who deals with others in society. Its
            physical body is a medium through which he can verbalize
            his thoughts. The real person is embodied in the thoughts
            of the personality. So judge not a person’s physicality but
(20)      his thoughts.