1154
Śrīmad-Bhāgavatam
[Canto 4, Ch. 25]
windows, and the eyelids are compared to protective gates. The three types of metal—gold, silver and iron—represent the three modes of material nature. Gold represents goodness, silver passion, and iron ignorance. The body is also sometimes considered to be a bag containing three elements ( tri-dhātu ): mucus, bile and air ( kapha, pitta  and  vāyu ).  Yasyātma-buddhiḥ kuṇape tri-dhātuke  ( Bhāg.  10.84.13). According to  Bhāgavatam , one who considers this bag of mucus, bile and air to be the self is considered no better than a cow or an ass.
TEXT 15
नीलस्फटिकवैद्यं पुक्तामरक्तारुणैः । 
    क्तमहर्म्यस्थलीं दीप्तां श्रिया भोगवतीमिव ॥१५॥
nīla-sphaṭika-vaidūrya- 
    muktā-marakatāruṇaiḥ 
    klpta-harmya-sthalīm dīptām 
    śriyā bhogavatīm iva
nīla —sapphires;  sphaṭika —crystal;  vaidūrya —diamonds;  muktā —pearls;  marakata —emeralds;  aruṇaiḥ —with rubies;  klpta —bedecked;  harmya-sthalīm —the floors of the palaces;  dīptām —lustrous;  śriyā —with beauty;  bhogavatīm —the celestial town named Bhogavatī;  iva —like.
TRANSLATION
The floors of the houses in that city were made of sapphire, crystal, diamonds, pearls, emeralds and rubies. Because of the luster of the houses in the capital, the city was compared to the celestial town named Bhogavatī.
PURPORT
In the city of the body, the heart is considered to be the capital. Just as the capital of a state is especially gorgeously filled with various high buildings and lustrous palaces, the heart of the body is filled with various desires and plans for material enjoyment. Such plans are sometimes compared to valuable jewels such as sapphires, rubies, pearls and emeralds. The heart becomes the center for all planning for material enjoyment.
TEXT 16
प्रयावत्वरयाधिराकोदायतनापणैः । 
    चैत्यञ्चजपताकाभिर्युक्तां विद्धुमवेदिभिः ॥१६॥