18.50 One who has attained 'perfection', viz., one who has attained perfection in meditation generated by the Karma Yoga performed day after day till death - how, in what way, he attains the brahman, learn this from Me in brief. It is the same Brahman who is described as the supreme consummation of knowledge. The meaning is that the self is the supreme consummation, the supreme end, of knowledge which is of the nature of meditation.