Sāṅkhya Enumeration of Tattvas, Distinction of Puruṣa–Prakṛti, and the Mechanics of Birth and Death
सत्त्वसङ्गादृषीन्देवान् रजसासुरमानुषान् । तमसा भूततिर्यक्त्वं भ्रामितो याति कर्मभि: ॥ ५२ ॥
sattva-saṅgād ṛṣīn devān rajasāsura-mānuṣān tamasā bhūta-tiryaktvaṁ bhrāmito yāti karmabhiḥ
L’âme conditionnée, contrainte d’errer par son karma, par contact avec la bonté naît parmi les sages ou les demi-dieux; par la passion elle devient démon ou humain; et par l’ignorance elle naît comme esprit errant ou dans le règne animal.
The word tiryaktvam means “the status of an animal,” which includes all lower forms of life, such as beasts, birds, insects, fish and plants.
This verse explains that association with sattva elevates one to the level of sages and devas, rajas leads to human/asuric conditions, and tamas degrades one to animal or ghostly states—one wanders accordingly due to karma.
In the Uddhava Gita, Krishna is teaching Uddhava how material nature (the gunas) binds the soul and how karmic action, shaped by those modes, propels the jiva through higher and lower births.
Choose sāttvika association and habits (truthfulness, cleanliness, self-control, uplifting company), reduce rājasic agitation (restless desire and ego-driven work), avoid tāmasic choices (intoxication, laziness, cruelty), and orient actions toward devotion to transcend the gunas.