Yōga Sūtra 3.44

बहिरकल्पिता वृत्तिर्महाविदेहा ततः प्रकाशावरणक्षयः।

bahirakalpitā vr̥ttirmahāvidēhā tataḥ prakāśāvaraṇakṣayaḥ।

[बहिः अकल्पिता वृत्तिः महा विदेहा ततः प्रकाश आवरण क्षयः।
bahiḥ = external; akalpitā = unimagined; vr̥ttiḥ = activities; mahā = great; vidēhā = non-body (spirit); tataḥ = from it; prakāśa = effulgent; āvaraṇa = the veil that covers; kṣayaḥ = is removed;]

By samyama on external unimagined activities and the great non-body (the spirit), the veil that covers the effulgent, is removed.