Yoga Sūtra Chapter Four verse 10

तासामनादित्वं चाशिषो नित्यत्वात् ॥१०॥

tāsām-anāditvaṃ cā-āśiṣaḥ nityatvāt ||10||

And the beginninglessness of these is due to the eternality of primordial desire.

tāsām - of theseanāditva - beginninglessnessca - andāśis - will to live; desire for self-welfare; primordial desire; prayer, wish, asking for; blessing for, benedictionnityatvā - eternality