tasmāt — therefore; oṁ — beginning with oṁ; iti — thus; udāhṛtya — indicating; yajña — of sacrifice; dāna — charity; tapaḥ — and penance; kriyāḥ — performances; pravartante — begin; vidhāna-uktāḥ — according to scriptural regulation; satatam — always; brahma-vādinām — of the transcendentalists.