śraddhāvān jana haya bhakti-adhikārī
'uttama', 'madhyama', 'kaniṣṭha' — śraddhā-anusārī
śraddhāvān jana - a person with faith; haya - is; bhakti-adhikārī - eligible for discharging transcendental loving service to the Lord; uttama - first class; madhyama - intermediate; kaniṣṭha - the lowest class; śraddhā-anusārī - according to the proportion of faith.
The word śraddhāvān (faithful) means understanding Kṛṣṇa to be the summum bonum — the eternal truth and absolute transcendence. If one has full faith in Kṛṣṇa and confidence in Him, one becomes eligible to discharge devotional service confidentially. According to one’s faith, one is a topmost, intermediate or inferior devotee.