Ego made of guNas can be highly deceptive.

Ego made of guNas can be highly deceptive. Along the path the sAdhaka can be tempted to describe another person or place as tAmasic or rAjasic. This can be a dangerous viewpoint that impedes yoga.

Only one who has directly experienced that which is beyond the guNas is qualified to make such a statement.

The guNas don't exist separately from each other. In the apparently most tAmasic or rAjasic person or object there exists sattva. Besides, all cognition of objects and people by the mind that sees difference due to the impure ego is itself formed of the three guNas! Since the very perception of difference arises from the three guNas and is mAyA and the cause of viyoga, how can the pot call the kettle black?

Recall the Biblical statement concerning the hypocrisy of seeing the mote in another's eye while ignoring the log in one's own.

Therefore, in general it is best to apply all criticisms only to oneself and not to others. Only a Guru might point out to a true disciple the imbalance of guNas at an early stage of practice. The ultimate Guru DakshinAmUrti gives upadesham in silence, and is beyond the guNas.