Because of their favorability, the six qualities beginning with enthusiasm should be honored –
bhajane utsaha yara bhitare bahire, sudurllabha krsna-bhakti pabe dhire dhire krsna-bhakti prati yara visvasa niscaya, sraddhavan bhaktiman jana sei haya krsna-seva na paiya dhira-bhave yei, bhaktira sadhana kare bhaktiman sei yahate krsnera seva krsnera santosa, sei karme vrati sada na karaye rosa krsnera abhakta-jana-sanga parihari’, bhaktiman bhakta-sange sada bhaje hari krsna-bhakta yaha kare tad anusarane, bhaktiman acaraya jivane marane ei chaya jana haya bhakti adhikari, visvera-mangala kare bhakti paracari (Bengali verse by Sri Bhakti Siddhanta Saraswati Thakura)
“Within, without, he who serves with (1) enthusiasm will gradually attain to the rarest pure devotion. In devotion to Lord Krsna, one who has (2) firm faith is a person loyal and devoted on the path. And if Sri Krsna’s service he fails to attain, yet practices with (3) patience – devout is such a man. (4) That which serves Lord Krsna, for only Krsna’s pleasure, in such action, the devotee can never feel anger. (5) Abandoning the company of the non-devotee, ever with devotees, the devout serve Sri Hari. (6) Following the pure devotees’ direction on the path, the true devout practice, as a matter of life and death. Who follow these six qualities qualify for pure devotion – they purify the universe by their preaching mission.” (Bengali verse translation)
[from Srila Bhakti Rakshak Sridhar, Sri Prapanna Jivanamrtam 3.5]