One should assume that they are the glasses the Guru wears. If one's glasses are dirty, one cannot see properly. In the same way, by being Gurudev's glasses, let us clean the dirt in ourselves first. One must feel that Guru's X-ray eyes would see the slightest dirt in us and therefore we would keep the glasses (us) clean all the time.
It is not the glasses that see but the eyes. Glasses are only an aid. If one is Gurudev's glasses one must see things as He sees. One must adjust one's vision according to His. In this Bhava one is in Gurudev's company for greater part of the day as glasses are in use. Just imagine being the glasses of Gurudev; suddenly...you feel the need to be good to yourself, good to others, and constantly feel that your actions are being watched from up close.
Om Sai Ram!
courtesy shri prasad (shirdisaigroup)