Bhagavan: ( )…Otherwise, the aspirant will in all likelihood unknowingly mistake the shunyastithi [state of emptiness] to be Jnana and rest in it, eventually becoming hopelessly lost.   

It is an unfortunate fact that many teachers of meditation tutor shunyastithi and purposely delude their pupils into believing that it is Jnana.

Shunyastithi [state of emptiness] is a deadly spiritual poison. 

It drives one away from the Heart, thereafter the lost ground has to be recovered all the way by means of doubling-back if Jnana is to be reached. That is why meditation is not encouraged here, but only Vichara.