SB 5.14.4
yatha hy anuvatsaram krsyamanam apy adagdha-bijam ksetram punar evavapana-kale gulma-trna-virudbhir gahvaram iva bhavaty evam eva grhasramah karma-ksetram yasmin na hi karmany utsidanti yad ayam kama-karanda esa avasathah.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Every year the plowman plows over his grain field, completely uprooting all weeds. Nonetheless, the seeds lie there and, not being completely burned, again come up with the plants sown in the field. Even after being plowed under, the weeds come up densely. Similarly, the grhastha-asrama [family life] is a field of fruitive activity. Unless the desire to enjoy family life is completely burned out, it grows up again and again. Even though camphor may be removed from a pot, the pot nonetheless retains the aroma of camphor. As long as the seeds of desire are not destroyed, fruitive activities are not destroyed.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Unless one’s desires are completely transferred to the service of the Supreme Personality of Godhead, the desire for family life continues, even after one has taken sannyasa. Sometimes in our society, ISKCON, a person out of sentiment may take sannyasa, but because his desires are not burned completely, he again takes to family life, even at the risk of losing his prestige and disgracing his good name. These strong desires can be burned out completely when one fully engages in the service of the Lord in devotional service.