Spiritual Import of Religious Festivals : 10-10.

Chapter 10: The Esoteric Significance of the Devi Mahatmya -10.
  ( A talk given on the 13th of October, 1972, during the Navaratri worship.)
 By Swami Krishnananda

Sattva is also a Guna, unfortunately.

We always praise Sattva and regard it as a very desirable thing.

But it is like a transparent glass that is placed between us and the Truth.

You can see through it, but you cannot go beyond it because though the glass is transparent, it can obstruct your movement.

It is not like a brick wall, completely preventing your vision, as Tamas does; it is not like a blowing wind which simply tosses you here and there, as Rajas does; it is a plain glass, through which you can have vision of Reality, but you cannot contact Reality nevertheless.

Swami Krishnananda
To be continued  ...