Nirveda, harṣa and other symptoms are explained in Madhya-līlā 14.167. The transitory elements (vyabhicārī) are described in the Bhakti-rasāmṛta-sindhu (2.4.1—3) as follows: athocyante trayas triṁśad- bhāvā ye vyabhicāriṇaḥviśeṣeṇābhimukhyena caranti sthāyinaṁ prativāg-aṅga-sattva-sūcyā ye jñeyās te vyabhicāriṇaḥ sañcārayanti bhāvasya gatiṁ sañcāriṇo’pi teunmajjanti nimajjanti stāyiny amṛta-vāridhauūrmi-vad vardhayanty enaṁ yānti tad-rūpatāṁ ca te “There are thirty-three transitory elements, known as vyabhicārī ecstatic emotions. They especially wander about the permanent sentiments as assistants. They are to be known by words, by different symptoms seen in the limbs and in other parts of the body, and by the peculiar conditions of the heart. Because they set in motion the progress of the permanent sentiments, they are specifically called sañcārī, or impelling principles. These impelling principles rise up and fall back in the permanent sentiments of ecstatic love like waves in an ocean of ecstasy. Consequently they are called vyabhicārī.”