Yoga Sutras 4.10

Patanjali, explained by Swami Vivekananda

तासामनादित्वं चाशिषो नित्यत्वात् ॥

tāsāmanāditvaṃ cāśiṣo nityatvāt

Thirst for happiness being eternal, desires are without beginning.

In plain words: Every living being always wants to be happy. Because that wish never ends, desires have no starting point.

Yoga Sutras 4.10

Ask the Swami about this

Swami Vivekananda explains

All experience is preceded by desire for happiness. There was no beginning of experience, as each fresh experience is built upon the tendency generated by past experience; therefore desire is without beginning.