SB 6.1.52
dehy ajño ’jita-sad-vargo
necchan karmani karyate
kosakara ivatmanam
karmanacchadya muhyati
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The foolish embodied living entity, inept at controlling his senses and mind, is forced to act according to the influence of the modes of material nature, against his desires. He is like a silkworm that uses its own saliva to create a cocoon and then becomes trapped in it, with no possibility of getting out. The living entity traps himself in a network of his own fruitive activities and then can find no way to release himself. Thus he is always bewildered, and repeatedly he dies.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
As already explained, the influence of the modes of nature is very strong. The living entity entangled in different types of fruitive activity is like a silkworm trapped in a cocoon. Getting free is very difficult unless he is helped by the Supreme Personality of Godhead.