The nine forms of devotional service are sravanam kirtanam visnoh smaranam pada-sevanam arcanam vandanam dasyam sakhyam atma-nivedanam

Attachment for Kṛṣṇa never wanes; it increases more and more as one attains different stages. All the stages together are called sthāyibhāva, or continuous existence of ecstasy. The nine forms of devotional service are śravaṇaṁ kīrtanaṁ viṣṇoḥ smaraṇaṁ pāda-sevanam arcanaṁ vandanaṁ dāsyaṁ sakhyam ātma-nivedanam (SB 7.5.23). When continuous love of Godhead is mixed with the processes of devotional service, it is called vibhāva, anubhāva, sāttvika and vyabhicārī. The devotee thus enjoys a variety of transcendental bliss. In his Amṛta-pravāha-bhāṣya, Śrīla Bhaktivinoda Ṭhākura states that anubhāva can be divided into thirteen categories: (1) dancing, (2) rolling on the ground, (3) singing, (4) yelling, (5) jumping, (6) making loud noises, (7) yawning, (8) heavy breathing, (9) not caring for public opinion, (10) discharging saliva, (11) roaring laughter, (12) unsteadiness and (13) hiccuping. These are the symptoms of anubhāva. Thus the transcendental mellows are experienced in different stages. Similarly, there are many other forms of expression that have been analytically studied by the Gosvāmīs. In the Bhakti-rasāmṛta-sindhu, Rūpa Gosvāmī gives each and every symptom a particular name.