PURPORT

It is therefore concluded that the mind is the cause of material existence and liberation also. Everyone is suffering in this material world because of the mind; it is therefore proper to train the mind or to cleanse the mind from material attachment and engage it fully in the Lord's service. This is called spiritual engagement. As confirmed in Bhagavad-gita:

mam ca yo 'vyabhicarena
bhakti-yogena sevate
sa gunan samatityaitan
brahma-bhuyaya kalpate

"One who engages in full devotional service, who does not fall down in any circumstance, at once transcends the modes of material nature and thus comes to the level of Brahman." (Bg. 14.26)

We should engage the mind fully in Krsna conscious activities. Then it will be the cause of our liberation, for our returning home, back to Godhead. However, if we keep the mind engaged in material activities for sense gratification, it will cause continuous bondage and will make us remain in this material world in different bodies, suffering the consequences of our different actions.