1346
Śrīmad-Bhāgavatam
[Canto 3, Ch. 31]
PURPORT
The expansion of ignorance is explained in this verse. The first ignorance is to identify one's material body, which is made of five elements, as the self, and the second is to accept something as one's own due to a bodily connection. In this way ignorance expands. The living entity is eternal, but because of his accepting nonpermanent things, misidentifying his interest, he is put into ignorance, and therefore he suffers material pangs.
TEXT 31
तदर्थं कुरुते कर्म यद्वद्धो याति संसृतिम् । योऽनुयाति ददत्क्लेशमविद्याकर्मबन्धनः ॥३१॥
tad-artham kurute karma yad-baddho yāti saṁsṛtim yo 'nuyāti dadat kleśam avidyā-karma-bandhanaḥ
tat-artham—for the sake of the body; kurute—he performs; karma—actions; yat-baddhaḥ—bound by which; yāti—he goes; saṁsṛtim—to repeated birth and death; yaḥ—which body; anuyāti—follows; dadat—giving; kleśam—misery; avidyā—by ignorance; karma—by fruitive activities; bandhanaḥ—the cause of bondage.
TRANSLATION
For the sake of the body, which is a source of constant trouble to him and which follows him because he is bound by ties of ignorance and fruitive activities, he performs various actions which cause him to be subjected to repeated birth and death.
PURPORT
In  Bhagavad-gītā  it is said that one has to work to satisfy Yajña, or Viṣṇu, for any work done without the purpose of satisfying the Supreme Personality of Godhead is a cause of bondage. In the conditioned state a living entity, accepting his body as himself, forgets his eternal relationship with the Supreme Personality of Godhead and acts on the interest of his body. He takes the body as himself, his bodily expansions as his kinsmen