Science of Identity Foundation:

You are your body, right? You are chemical in essence ... right? At least, that’s what one of America’s most influential scientists claims:
I am a collection of water, calcium and organic molecules called Carl Sagan. You are a collection of almost identical molecules with a different collective label.^*
Like Sagan, most people believe that they are their body. So if you ask them who they are, they think and respond in terms of bodily labels.
“I’m Susan. I’m blond, 29 years old, a mother, and still 36-24-36!”
“I’m Henry. I’m a white American male and proud of it!”
“I’m John. I’m a lawyer. I’m 40 years old and getting older every day.”
“I’m Alice. I’m a female student. I’m fat and I’m a Methodist.”
Name, race, age, sex, religion, nationality, occupation, height, weight, and so on—all these are bodily labels. Therefore if you consider your body to be yourself, you automatically identify yourself with such labels. If your body is fat and ugly, you think, “Woe is me! I am fat and ugly.” If your body is 60 years old and female, you think, ”I am a 60-year-old female.” If your body is black and beautiful, you think, “I am black and beautiful.”
But is the body really the self? Are you really your body?
Science of Identity Foundation – Siddhaswarupananda
*Carl Sagan, Cosmos (New York: Random House, 1980), p. 127.

The Supreme Person is not involved in the transmigratory process as the conditioned living beings are, since His form never undergoes transformation. He does not take on and put off different bodies as the living beings do, because He is not different from His body. When the Supreme Person appears within the material world, He does so in His original transcendental form. Although He is the oldest of old, His form remains ever-youthful, without deterioration or old age.¹²

MICHAEL: You say the form of the Supreme Person is spiritual and not material, but I've always been led to believe that spirit is formless. Indeed, the very concept of "spirit" is vague and ephemeral.

TEACHER: Do you accept that spiritual energy is superior to material energy?

MICHAEL: Yes, it must be so.

TEACHER: Then how is it that matter, the inferior of the two energies, can have specific shape or form, whereas spirit cannot? If, in fact, spirit is superior, is it not logical to conclude that not only can it possess form, but that those spiritual forms must also be superior in every way to the forms which we perceive with our senses?

MICHAEL: Well, yes, I never considered it in that way.