Yōga Sūtra 2.39

अपरिग्रहस्थैर्ये जन्मकथन्तासम्बोधः।

aparigrahasthairyē janmakathantāsambōdhaḥ।

[अपरिग्रह स्थैर्ये जन्म कथन्ता सम्बोधः।
aparigraha = when non-possession is practiced; sthairyē = with steadfastness; janma = cause of birth; kathantā = story; sambōdhaḥ = is revealed;]

When non-possession is practiced with steadfastness, the story regarding cause of birth is revealed.