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The Nectar of Devotion
Devotional service means to prosecute Krṣṇa conscious activities which are favorable to the transcendental pleasure of the Supreme Lord Krṣṇa, and any activities which are not favorable to the transcendental favor of the Lord cannot be accepted as devotional service. For example, great demons like Rāvaṇa, Kamsa and Hiraṇyakaśipu were always thinking of Krṣṇa, but they were thinking of Him as their enemy. This sort of thinking cannot be accepted as  bhakti  or Krṣṇa consciousness.
The impersonalists sometimes misunderstand devotional service in such a way that they divide Krṣṇa from His paraphernalia and pastimes. For example, the  Bhagavad-gītā  is spoken on the battlefield of Kurukṣetra, and the impersonalists say that although Krṣṇa is of interest, the battlefield of Kurukṣetra isn't. The devotees, however, also know that the battlefield of Kurukṣetra by itself has nothing to do with their business, but in addition they know that "Krṣṇa" does not mean just Krṣṇa alone. He is always with His associates and paraphernalia. For instance, if someone says, "Give something to eat to the man with the weapons," the eating process is done by the man and not by the weapons. Similarly, in Krṣṇa consciousness, a devotee may be interested in the paraphernalia and locations—such as the battlefield of Kurukṣetra—which are associated with Krṣṇa, but he is not concerned with simply any battlefield. He is concerned with Krṣṇa—His speech, His instructions, etc. It is because Krṣṇa is there that the battlefield is so important.
This is the summary understanding of what Krṣṇa consciousness is. Without this understanding one is sure to misunderstand why the devotees are interested in the battlefield of Kurukṣetra. One who is interested in Krṣṇa becomes interested in His different pastimes and activities.
The definition of a pure devotee, as given by Rūpa Gosvāmī in  Bhakti-rasāmṛta-sindhu , can be summarized thus: his service is favorable and is always in relation to Krṣṇa. In order to keep the purity of such Krṣṇa conscious activities, one must be freed from all material desires and philosophical speculation. Any desire except for the service of the Lord is called material desire. And philosophical speculation refers to the sort of speculation which ultimately arrives at a