80
Śrīmad-Bhāgavatam
[Canto 7, Ch. 12]
constituents of the body are caused by various elements, and they should be merged again into those elements.
PURPORT
To be self-realized, one must understand the original sources of the various elements of the body. The body is a combination of skin, bone, muscle, blood, semen, urine, stool, heat, breath and so on, which all come from earth, water, fire, air and sky. One must be well conversant with the sources of all the bodily constituents. Then one becomes a self-realized person, or  ātmavān , one who knows the self.
TEXTS 26-28
वाचमग्नौ सवक्तव्यामिन्द्रे शिल्पं करावपि । 
    पदानि गत्या वयसि रत्योपस्थं प्रजापतौ ॥२६॥ 
    मृत्यौ पायुं विसर्गं च यथास्थानं विनिर्दिशेत् । 
    दिक्षु श्रोत्रं सनादेन स्पर्शेनाच्यात्मनि त्वचम् ॥२७॥ 
    रूपाणि चक्षुषा राजन् ज्योतिष्यमिनिवेशयेत् । 
    अप्सु प्रचेतसा जिह्वां घ्रेयैर्घ्राणं क्षितौ न्यसेत् ॥२८॥
vācam agnau savaktavyām 
    indre śilpam karāv api 
    padāni gatyā vayasi 
    ratyopastham prajāpatau
mṛtyau pāyum visargam ca 
    yathā-sthānam vinirdiśet 
    dikṣu śrotram sa-nādena 
    sparśenādhyātmani tvacam
rūpāṇi cakṣuṣā rājan 
    jyotiṣy abhiniveśayet 
    apsu pracetasā jihvām 
    ghreyair ghrāṇam kṣitau nyaset
vācam —speech;  agnau —in the fire-god (the personified god controlling fire);  sa-vaktavyām —with the subject matter of speaking;  indre —