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Śrīmad-Bhāgavatam
[Canto 3, Ch. 29]
TRANSLATION
Lord Kapila, the Personality of Godhead, replied: O noble lady, there are multifarious paths of devotional service in terms of the different qualities of the executor.
PURPORT
Pure devotional service in Kṛṣṇa consciousness is one because in pure devotional service there is no demand from the devotee to be fulfilled by the Lord. But generally people take to devotional service with a purpose. As stated in  Bhagavad-gītā , people who are not purified take to devotional service with four purposes. A person who is distressed because of material conditions becomes a devotee of the Lord and approaches the Lord for mitigation of his distressed condition. A person in need of money approaches the Lord to ask for some improvement in his monetary condition. Others, who are not in distress or in need of monetary assistance but are seeking knowledge in order to understand the Absolute Truth, also take to devotional service, and they inquire into the nature of the Supreme Lord. This is very nicely described in  Bhagavad-gītā  (7.16). Actually the path of devotional service is one without a second, but according to the devotees' condition, devotional service appears in multifarious varieties, as will be nicely explained in the following verses.
TEXT 8
अभिसन्धाय यो हिंसां दम्भं मात्सर्यमेव वा । संरम्भी भिन्नदग्भावं मयि कुर्यात्स तामसः ॥ ८ ॥
abhisandhāya yo himsām   dambham mātsaryam eva vā   samrambhī bhinna-dṛg bhāvam   mayi kuryāt sa tāmasaḥ
abhisandhāya —having in view;  yaḥ —he who;  himsām —violence;  dambham —pride;  mātsaryam —envy;  eva —indeed;  vā —or;  samrambhī —angry;  bhinna —separate;  dṛk —whose vision;  bhāvam —devotional service;  mayi —to Me;  kuryāt —may do;  saḥ —he;  tāmasaḥ —in the mode of ignorance.