yo ’yam yogas tvaya proktah
etasyaham na pasyami
cancalatvat sthitim sthiram
"Arjuna said: O Madhusudana, the system of yoga which You have summarized appears impractical and unendurable to me, for the mind is restless and unsteady."
Madhsudana = O! The Great, Who killed the demons Madhu and Kaitapa. Here Swami Vedanta Desika in his Tatparya Chandrika says that leave alone the slaying of Madhu and Kaitapa, first destroy the demons rajo and tamo qualities in us to cultivate satva quality. Samyena yoga tvaya prokta = viewing all equally as yoga was preached by You [Sri Krishna] [in the last four slokas], etasya = its[yoga's], sthiram sthtim = stable character, na pasyami = [I, Arjuna] do not see, cancalatvat = [mind] is always wavering [ unsteady]. Because mind is never stable, the yoga preached by Sri Krishna can not be seen by Arjuna. It appears to be impossible for Arjuna. To succeed, first sama darshan has to be achieved. One has to view Paramatma nad jeevatman as equal and view all atman as equal. But in this world differences only are perceptible. We see all as different as humans, animals, trees and insects. We are habituated to see variants only. To view oneness of all atman we need to practice yoga. We have to do meditation shutting our sense organs from all outside matters. We have to see atman without the body. If we can do that we will realize that all atman are equal. But the impediment is mind and it is highly unstable. So, Arjuna feels that there are not any who could control mind and realize atman swaroopam. OK, at least is it possible to see equality with Paramatman? This is still more difficult. In atman mukta swaroopam alone one could realize that the knowledge of atman and Paramatman is same as also the eight characteristics. So in both Arjuna finds persons qualifying are rare. This, he is going to further explain in the next sloka. But with grace of the Divya Dampathi, Sri Padmasani Thayar and Sri Adi Jagannatha Perumal, even this seemingly impossible can be achieved.