Saint says that our mind is the reason for both bondage and liberation. The key is to open the lock. Bonding with the mind is liberation from the mind.
When the key is rotated on one side, the lock is opened and if rotated to the other side, the lock is closed. The man is flickering like a cup. It is Gurujan who explains the technique, tactics or ways to control the mind.
The mind is the only instinct. If the instinct is towards the world, then it is a fall and if it is towards God, then there is a hymn.