sarvasam api siddhinam
hetuh patir aham prabhuh
aham yogasya sankhyasya
My dear Uddhava, I am the cause, the protector and the Lord of all mystic perfections, of the yoga system, of analytic knowledge, of pure activity and of the community of learned Vedic teachers.
According to Srila Sridhara Svami, the word yoga here indicates liberation from material life, and sankhya indicates the means of obtaining liberation. Thus Lord Krsna is not merely the Lord of material yoga perfections, but of the highest liberated perfections as well. One can obtain sankhya, or knowledge leading to liberation, by performing pious activities, and Lord Krsna is also the cause, protector and Lord of such activities as well as of the learned teachers who instruct ordinary people in the means of piety. In many different ways Lord Krsna is the real object of meditation and worship for every living entity. Lord Krsna through the expansion of His potencies is everything, and this simple understanding, called Krsna consciousness, is the supreme perfection of the yoga system.