tasmād bhārata sarvātmā bhagavān īśvaro hariḥ śrotavyaḥ kīrtitavyaś ca smartavyaś cecchatābhayam

"O descendant of King Bharata, one who desires to be free from all miseries must hear, glorify and also remember the Supreme Personality of Godhead, who is the Supersoul, the controller and the savior from all miseries." (Bhag. 2.1.5) This is the summary of all the activities of a Vaisnava, and the same instruction is repeated here (krsna-smrti vinu haya nisphala jivana). Srila Rupa Gosvami states in Bhakti-rasamrta-sindhu [1.3.25], avyartha-kalatvam: A Vaisnava must be very alert not to waste even a second of his valuable lifetime. This is a symptom of a Vaisnava. But association with pounds-and-shillings men, or visayis, materialists who are simply interested in sense gratification, pollutes one's mind and hampers such continuous remembrance of Lord Krsna. Sri Caitanya Mahaprabhu therefore advised, asat-saṅga-tyaga-ei vaisnava-acara: a Vaisnava should behave in such a way as to never assosiate with nondevotees or materialists (Cc. Madhya 22.87). One can avoid such association simply by always remembering Krsna within his heart.