Question: Is the mind ultimately the only way to attain Mukti marga?

Babaji: 

Yes. But while that is true I don't think only by this method which we teach can it be done - not only by closing the eyes. Even when you are at work, if the mind is at peace and withdrawn and peaceful, then this is a form of meditation.

Likewise in bhakti marga - the devotional path - one's attention would be only on the deity. So this is also a form of meditation.

In karma yoga, if one acts with attention and accepts the results whatever they are, then the mind becomes quiet and this also is a form of meditation.