The Veda is called Sruti (because it is learnt by hearing). It has four interwoven parts.
VEDA | |||
RIG |
YAJUR |
SAMA |
ATHARVA |
Hymns or prayers |
Prayers in Sacrifice |
Prayers in Musical form |
World Maintenance |
To make these four sections more easily performable Vyasa Deva compiled these four parts into four separate books. Being sympathetic towards the fallen souls of Kali-Yuga, who are lazy, misdirected and have no inclination for spiritual life, Vyasa Deva compiled the Purana, from related historical facts, which explain the teachings of the four Vedas. In other words, the Purana teach the Vedic literature in story form, making spiritual life more simple, and therefore in this age, they are more important. (Ref.: S.B. Canto 1 Ch.4 text 19-23)
There are eighteen Purana that are divided into three groups along with three predominating Deities.
| Guna | Nature | Action of the Deity | Deity |
| Satwa | Goodness | Preservation of Goodness | Vishnu |
| Rajas | Passion | Overcoming Passion | Brahma |
| Tamas | Ignorance | Destruction of Ignorance or Beginning of Knowledge | Siva |
They are divided in this way to gradually raise the conditioned soul from ignorance to pure goodness. The three divisions of the Purana are compiled in this way to appeal to those people in these respective modes and to thus elevate them to the perfection of life.
A description of varnasrama;
It describes the Sveta Varaha Kalpa, Vishnu dharmotara; A description of the age of Kali; The six angas of the Veda;Contains the glories of devotional service;
Prediction of Lord Caitanya.Danvantari;
Describes the Laksmi Kalpa.The glories of Gayatri.
A Purana describes;
After compiling the Vedic Literatures, Purana, etc., Vyasa Deva was still feeling unsatisfied. While thinking in this way Narada Muni reached the cottage of Vyasa Deva and was asked about the cause of dissatisfaction. Narada Muni explained that because he (Vyasa Deva) did not directly describe Krsna's pastimes, and instead gave a license to enjoy sense gratification under religious principles, he was remaining unsatisfied. Narada then instructed Vyasa Deva in the (Catur Sloka – Srimad Bhagavatam) the essence of the Veda. Vyasa Deva took these four verses and expanded them to compile the Srimad Bhagavatam, which is known as the ripened fruit of Vedic literature because it directly describes Krsna's transcendental pastimes. (Ref. S.B. 1, chapter 5)

I meditate on the most merciful Sri Krsna. Whose bodily hue is like a tamala tree. He has appeared for everyone's benefit in the form of Srimad Bhagavatam. The srimad Bhagavatam is like a bridge for crossing over the unending ocean of birth and death.
This Bhagavata Purana is as brilliant as the sun, and it has arisen just after the departure of Lord Krsna to His own abode, accompanied by religion, knowledge, etc. Persons who have loost their vision due to the dense darkness of ignorance in the age of Kali shall get light from this Purana. (S.B. 1:3:43)
The Srimad Bhagavatam describes 10 subjects: (S.B. 2:10:1)
The Supreme Lord has diverse and innumerable energies which are beyond our conception; however, great learned sages or liberated souls have studied these energies and have analyzed them into three parts. All of the energies are of Vishnu -Shakti, that is to say they are different potencies of Lord Vishnu. The first energy is Para, transcendental. Living entities also belong to the superior energy. The other energies, or material energies, are in the mode of ignorance. (Vishnu Purana 6.7.61).
Krsna is the saktimana or the source of all energy. (Bg. 7.6)
a) The spiritual energy is eternal, full of knowledge and bliss. It is transcendental and beyond all changes ofmaterial nature.
b) The external energy is the exact opposite and is therefore temporary, full of ignorance and misery. It is mundane and always changing.
c) The marginal energy (jiva) also belongs to the spiritual energy, but because he has the independence to be either in the spiritual world or the material world, he is called marginal.
The whole manifestation is the Lord himself by diffusion of His different energies only, namely the internal, external and marginal. Such energy is siultaneously one with and different from the Lord (acintya-bheda-abheda-tattva). (S.B. 2.9.27)
The material world is also called Durga or jail. Just as the jail is for those people who break the laws of the government, this material world is created for those souls who do not like to accept Krsna's supremacy. Just as the pupose of the jail is to reform criminals, in the same way the purpose of creation is to reform the conditioned soul or to get rid of his criminal desire to use Krsna's property without Krsna. (S.B. 2.10.46) (S.B. 2.9.19 purport)
OM TAT SAT