- Śruti - means what is heard by rishis or sages. This has no period and no author. example Upanishads
- Smriti - Sanadhana Varnashrama Dharma which means sacred law codes of Hindus. example is Bagavat Gita.
To be more precise, Śruti is what is heard and smriti is what is remembered or tradition. It is to be noted that Śruti will be given more prominence and Smriti should be in accordance to it. Any deviation of this results in rejection of Smriti.
Basically, Vedas and Upanishads are the Śrutis and to start with, one has to understand what these Upanishads are, how do they benefit posterity?
UPANISHAD
Split the word and what they mean
Upa means Near
Ni means Down
S(h)ad means Sit
Sit down near the guru to get his teachings.
The next is, Is Guru essential for spiritual growth?
Yes, Guru is essential for spiritual growth. Guru is the representative of God, even God in human form will have a guru standing as an example that a spiritual seeker ought to have a Guru.
It is said that there are about 350 upanishads
Traditionally 108 upanishads are followed
Rig Veda -10
Yajur Veda - 51 [White Yajur is 19 and Black Yajur is 32]
Sama Veda - 16
Atharvana - 31
Upanishads are based on the conversation between a Guru and his disciples. It's a kind of knowledge transfer to the disciples of the truth.
The most prominent one in upanishad is 'Katha Upanishad'.
Katha Upanishad:
Teacher: Yama or Yamaraj [ the God of death ]
Student: Nachiketa.
Verses: 120
Theme:
Vajashrava: The king of
- The first 10 is mukkya, i.e. principle upanishads
- The 16 upanishads are Sāmānya Vedāntā.
- 23 as Saanyāsa
- 9 as Shākta
- 13 as Vaishnava
- 14 as Shaiva
- 17 as Yoga
More Reading
http://www.celextel.org/108upanishads/