Endeavor executed with intelligence in Kṛṣṇa consciousness is called utsāha, or enthusiasm. The devotees find the correct means by which everything can be utilized in the service of the Lord (nirbandhaḥ kṛṣṇa-sambandhe yuktaṁ vairāgyam ucyate). The execution of devotional service is not a matter of idle meditation but practical action in the foreground of spiritual life.
These activities must be executed with patience. One should not be impatient in Kṛṣṇa consciousness. Indeed, this Kṛṣṇa consciousness movement was started single-handedly, and in the beginning there was no response, but because we continued to execute our devotional activities with patience, people gradually began to understand the importance of this movement, and now they are eagerly participating. One should not be impatient in discharging devotional service, but should take instructions from the spiritual master and execute them with patience, depending on the mercy of guru and Kṛṣṇa. The successful execution of Kṛṣṇa conscious activities requires both patience and confidence. A newly married girl naturally expects offspring from her husband, but she cannot expect to have them immediately after marriage. Of course, as soon as she is married she can attempt to get a child, but she must surrender to her husband, confident that her child will develop and be born in due time. Similarly, in devotional service surrender means that one has to become confident. The devotee thinks, avaśya rakṣibe kṛṣṇa: "Kṛṣṇa will surely protect me and give me help for the successful execution of devotional service." This is called confidence.
As already explained, one should not be idle but should be very enthusiastic about executing the regulative principles—tat-tat-karma-pravartana. Neglect of the regulative principles will destroy devotional service. In this Kṛṣṇa consciousness movement there are four basic regulative principles, forbidding illicit sex, meat-eating, gambling and intoxication. A devotee must be very enthusiastic about following these principles. If he becomes slack in following any of them, his progress will certainly be checked. Śrīla Rūpa Gosvāmī therefore recommends, tat-tat-karma-pravartanāt: "One must strictly follow the regulative principles of vaidhī bhakti." In addition to these four prohibitions (yama), there are positive regulative principles (niyama), such as the daily chanting of sixteen rounds on japa-mālā beads. These regulative activities must be faithfully performed with enthusiasm. This is called tat-tat-karma-pravartana, or varied engagement in devotional service.
Furthermore, in order to be successful in devotional service one must give up the association of undesirable people. This includes karmīs, jñānīs, yogīs and other nondevotees. Once Śrī Caitanya Mahāprabhu was asked by one of His householder devotees about the general principles of Vaiṣṇavism, as well as the general routine activities of the Vaiṣṇava, and Śrī Caitanya Mahāprabhu immediately replied, asat-saṅga-tyāga,—ei vaiṣṇava-ācāra: (CC Madhya 22.87) "Characteristically, a Vaiṣṇava is one who gives up the association of worldly people, or nondevotees." Śrīla Narottama dāsa Ṭhākura has therefore recommended, tāṅdera caraṇa sevi bhakta-sane vāsa: one has to live in the company of pure devotees and execute the regulative principles laid down by the previous ācāryas, the six Gosvāmīs (namely, Śrī Rūpa Gosvāmī, Śrī Sanātana Gosvāmī, Śrī Jīva Gosvāmī, Śrī Raghunātha dāsa Gosvāmī, Śrī Gopāla Bhaṭṭa Gosvāmī and Śrī Raghunātha Bhaṭṭa Gosvāmī). If one lives in the association of devotees, there is little chance of associating with nondevotees. The International Society for Krishna Consciousness is opening many centers just to invite people to live in the company of devotees and practice the regulative principles of spiritual life.