THIS THIRST AFTER BODY IS THE GREAT BANE OF HUMAN LIFE. SO THE FIRST SIGN OF THE ESTABLISHMENT OF PURITY IS THAT YOU DO NOT CARE TO THINK YOU ARE A BODY.

शौचात्स्वाङ्गजुगुप्सा परैरसंसर्गः ॥४०॥

40. Internal and external cleanliness being established, there arises disgust for one's own body, and non-intercourse with others.

When there is real purification of the body, external and internal, there arises neglect of the body, and the idea of keeping it nice vanishes. A face which others call most beautiful will appear to the Yogi as merely animal, if there is not intelligence behind it. What the world calls a very common face he regards as heavenly, if the spirit shines behind it. This thirst after body is the great bane of human life. So the first sign of the establishment of purity is that you do not care to think you are a body. It is only when purity comes that we get rid of the body idea.

- Swami Vivekananda
The Complete Works of Swami Vivekananda/Volume 1/Raja-Yoga/Patanjali's Yoga Aphorisms - Concentration: Its Practice