rahasyaṁ hy etad uttamam

sah-the same ancient; eva-certainly; ayam-this; maya-by Me; te-unto you; adya-today; yogah-the science of yoga; proktah-spoken; puratanah-very old; bhaktah-devotee; asi-you are; me-My; sakha-friend; ca-also; iti-therefore; rahasyam-mystery; hi-certainly; etat-this; uttamam-transcendental.