You are infinite. You are really everywhere. But you think that you are the body, and therefore consider yourself limited. If you think you are the body, which is sitting, you do not know your true nature. If you were to look within and experience your own soul in its true nature, you would realize that you are infinite and beyond all creation. However, you identify yourself with the body. This false identification is due to ignorance, which makes itself effective through the medium of the mind. An ordinary person thinks that he is the physical body. A spiritually advanced individual thinks that he is the subtle body. The saint thinks that he is the mind. But in none of them is the soul having direct Self-knowledge. It is not a case of pure thinking unmixed with illusion.
The soul as Soul is infinite-aloof from mind or body-yet owing to ignorance, the soul comes under the sway of the mind and becomes a “thinker,” sometimes identifying itself with the body and sometimes with the mind. From the limited point of view of a person who has not gone beyond the domain of Maya, there are numberless individuals. It seems that there are as many individuals as there are minds and bodies. In fact, there is only one universal Soul, but the individual thinks that he is different from other individuals. The one and the same Soul is ultimately behind the minds of seemingly different individuals, and through them it has the multifarious experiences of duality. The One in the many comes to experience itself as one of the many. This is due to imagination or false thinking.
-Discourses 7th Ed, p16