If one chants the Hare Kṛṣṇa mantra while committing offenses, these unwanted creepers will grow. One should not take advantage of chanting the Hare Kṛṣṇa mantra for some material profit. As mentioned in verse 159:

‘niṣiddhācāra’, ‘kuṭīnāṭī’, ‘jīva-hiṁsana’
‘lābha’, ‘pūjā’, ‘pratiṣṭhādi’ yata upaśākhā-gaṇa

The unwanted creepers have been described by Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura. He states that if one hears and chants without trying to give up offenses, one becomes materially attached to sense gratification. One may also desire freedom from material bondage like the Māyāvādīs, or one may become attached to the yoga-siddhis and desire wonderful yogic powers. If one is attached to wonderful material activities, one is called siddhi-lobhī, greedy for material perfection. One may also be victimized by diplomatic or crooked behavior, or one may associate with women for illicit sex. One may make a show of devotional service like the prākṛta-sahajiyās, or one may try to support his philosophy by joining some caste or identifying himself with a certain dynasty, claiming a monopoly on spiritual advancement. Thus with the support of family tradition, one may become a pseudo guru, or so-called spiritual master. One may become attached to the four sinful activities — illicit sex, intoxication, gambling and meat-eating — or one may consider a Vaiṣṇava to belong to a mundane caste or creed. One may think, “This is a Hindu Vaiṣṇava, and this is a European Vaiṣṇava. European Vaiṣṇavas are not allowed to enter the temples.” In other words, one may consider Vaiṣṇavas in terms of birth, thinking one a brāhmaṇa Vaiṣṇava, another a śūdra Vaiṣṇava, another a mleccha Vaiṣṇava and so on. One may also try to carry out a professional business by means of chanting the Hare Kṛṣṇa mantra or reading Śrīmad-Bhāgavatam, or one may try to increase his monetary strength by illegal means. Also, one may become a cheap Vaiṣṇava by trying to chant in a secluded place for material adoration, or one may desire mundane reputation by making compromises with nondevotees concerning one’s philosophy or spiritual life, or one may become a supporter of a hereditary caste system. All these are pitfalls of personal sense gratification. Just to cheat some innocent people, one makes a show of advanced spiritual life and becomes known as a sādhu, mahātmā or religious person. All this means that the so-called devotee has become victimized by all these unwanted creepers and that the real creeper, the bhakti-latā, has been stunted.