For those who had little idea about Bhagavad Gita of Hinduism… the writer of Bhagavad Gita differs from author of Bhagavad Gita. Why? The composer and writer of Bhagavad Gita is Veda Vyasa… one who scripted Bhagavad Gita. During times of Lord Krishna… one who gave doctrine of Bhagavad Gita to mankind Lipi (the written word) was not in existence.
It was only around second century BCE, when Lipi (written script) came into existence… Veda Vyasa composed the sacred Bhagavad Gita. The author of Bhagavad Gita has always been Lord Krishna… an avatar of his era (God manifest in human form). As voluminous Vedas (Hinduism revelations) were unclear to mankind… Lord Krishna reduced essence of Vedas to Bhagavad Gita.
With coming of Bhagavad Gita, Dharma (righteousness) took its footing on mother earth. People finally realized it was only following teachings contained in Bhagavad Gita human beings could reach stage of enlightenment (kaivalya jnana in Hinduism). With coming of Bhagavad Gita… also termed Vedanta (end of Vedas)… the need for human beings to indulge in different Vedas ceased to exist.
The sermon of Bhagavad Gita was given by Lord Krishna in the battle of Mahabharata as a classic example to re-establish Dharma (righteousness) against evil forces of adharma (lawlessness). The sermon of Bhagavad Gita can only be delivered by an avatar of his era (God manifest in human form)… and never an enlightened one… a bodhi… a Jina… a Mahavira.
All initial sacred scriptures were direct revelations from God Almighty. During times of Vedas… the gist of entire Vedas got transferred to upcoming generations through word of mouth. Veda primarily means… spoken through the mouth (Ved stands for spoken word). For generations… the wisdom of Vedas percolated to masses through word of mouth.
Whence came Lipi (written script)… learned sages and saints of different era reduced wisdom of Vedas to writing. But voluminous in nature… wisdom contained in Vedas was incomprehensible to the masses. With coming of Lord Krishna… the wisdom of scriptures became available to masses. Veda Vyasa is also composer and writer of most revered epic Mahabharata.
Scriptural texts primarily are revelations from God Almighty. The authors of these revelations were sages and saints of different era. After evolution of Lipi (written script)… there were many writers (sages and saints of different era) who composed and wrote the presently available scriptural texts. The teachings of sacred scriptures reached masses only after evolution of Lipi… not before.