All upanishads talk about Divine mother. Vedas are divided into 3 parts. 1.Karma kaanda, 2.Upaasana kaanda, 3.Gnaana kaanda. Upaasana and Gnaana kaandas in these are called upanishads.
Upa means proximity
Ni means a step below
Shad means to sit
Upanishad means to sit close to and a step below to your guru and learn about paramaatma. You should never think that your are better than your guru. Irrespective of his status. You should learn from your guru with total focus and concentration of mind body and soul.
Upanishads are conversations between a guru and his disciples. A disciple who is in quest of truth approaches a guru who has known the paramaatma and serve him with strict discipline and devotion. When the guru is pleased, he will teach him the knowledge of Paramaatma. The disciple asks his doubts and guru answers all of them.
In total there are 1180 upanishads. Of these, 108 are most important. Of these, Eesha, Kena, Katha, Prashna, Mundaka, Maandukya, Thithirih, Aitareyam cha Chandogyam Bruhadaaranyakam dasah
1. Eeshavaasya, 2.Kena, 3.Katha, 4.Prashna, 5.Mundaka, 6.Maandukya, 7.Thithirih, 8.Aitareya, 9.Chandogya and 10.Bruhadaaranyaka upanishads are prominent as per Sri Shankara Bhagavathpaadaacharya.
Upanishads are the essence of vedas. They lay more emphasis on describing the various forms of paramaatma.
Brahmasatyam jaganmidhya
Paramaatma is the only truth. Rest all is an illusion
Satyam Gnaanam anantam brahma
Paramaatma is the purest form of truth and consciousness. It is imnipresent
Brahmavid brahmaiva bhavathi
One who learns about Paramaatma become Paramaatma.
