Srimad Bhagavatam Canto 08, Chapter 17, Text 23

SB 8.17.23

so ’dityam viryam adhatta
 tapasa cira-sambhrtam
samahita-mana rajan
 daruny agnim yathanilah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
O King, as the wind promotes friction between two pieces of wood and thus gives rise to fire, Kasyapa Muni, whose transcendental position was fully absorbed in the Supreme Personality of Godhead, transferred his potency into the womb of Aditi.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
A forest fire begins when two pieces of wood rub against one another, being agitated by the wind. Actually, however, fire belongs neither to the wood nor to the wind; it is always different from both. Similarly, here it is to be understood that the union of Kasyapa Muni and Aditi was not like the sexual intercourse of ordinary human beings. The Supreme Personality of Godhead has nothing to do with the human secretions of sexual intercourse. He is always completely aloof from such material combinations.
 
The Lord says in Bhagavad-gita (9.29), samo ’ham sarva-bhutesu: “I am equal toward all living entities.” Nonetheless, to protect the devotees and kill the demons, who were a disturbing element, the Lord entered the womb of Aditi. Therefore this is a transcendental pastime of the Lord. This should not be misunderstood. One should not think that the Lord became the son of Aditi the way an ordinary child is born because of sexual intercourse between man and woman.
 
Here it may also be appropriate to explain, in these days of controversy, the origin of life. The life force of the living entity — the soul — is different from the ovum and semen of the human being. Although the conditioned soul has nothing to do with the reproductive cells of man and woman, he is placed into the proper situation because of his work (karmana daiva-netrena). Life is not, however, a product of two secretions, but is independent of all material elements. As fully described in Bhagavad-gita, the living entity is not subject to any material reactions. He can neither be burnt by fire, cut by sharp weapons, moistened by water, nor dried by the air. He is completely different from the physical elements, but by a superior arrangement he is put into these material elements. He is always aloof from material contact (asango hy ayam purusah) but because he is placed in a material condition, he suffers the reactions of the material modes of nature.
 
purusah prakrti-stho hi
 bhunkte prakrtijan gunan
karanam guna-sango ’sya
 sad-asad-yoni-janmasu
 
“The living entity in material nature thus follows the ways of life, enjoying the three modes of nature. This is due to his association with that material nature. Thus he meets with good and evil amongst various species.” (Bg. 13.22) Although the living entity is aloof from the material elements, he is put into material conditions, and thus he must suffer the reactions of material activities.
Srimad Bhagavatam Canto 08, Chapter 17, Text 22
Srimad Bhagavatam Canto 08, Chapter 17, Text 24