As clearly stated in Bhagavad-gita (3.9), yajnarthat karmano 'nyatra loko 'yam-karma-bandhanah: if one does not act as a pure devotee, whatever acts he per forms will produce reactions of fruitive bondage (karma-bandhanah). In Srimad-Bhagavatam it is said:

"A materialistic person, madly engaged in activities for sense enjoyment, does not know that he is entangling himself in repeated birth and death and that his body, although temporary, is full of miseries." (Srimad-Bhagavatam 5.5.4) A visayi, a person blindly caught in a web of materialistic life, remains in the cycle of birth and death perpetually. Such a person cannot understand how to execute pure devotional service, and therefore he acts as a karmi, jnani, yogi or something else, according to his desire, but he does not know that the activities of karma, jnana and yoga simply bind one to the cycle of birth and death.