Bhagvat Gita Mahatmya (Glories) by Adi Shankaracharya
gita-shastram idam punyam, yah pathet prayatah puman
vishnoh padam avapnoti, bhaya-shokadi-varjitah.
One who, with a regulated mind, recites with devotion this Bhagavad-gita scripture which is the bestower of all virtue, will attain to a holy abode such as Vaikuntha, the residence of Lord Vishnu, which is always free from the mundane qualities based on fear and lamentation.
gitadhyayana-shilasya, pranayama-parasya ca
naiva santi hi papani, purva-janma-kritani ca
If one reads Bhagavad-gita very sincerely and with all seriousness, then by the grace of the Lord the reactions of his past misdeeds will not act upon him.
maline mocanam pumsam, jala-snanam dine dine
sakrid gitamrita-snanam, samsara-mala-nashanam
One may cleanse himself daily by taking a bath in water, but if one takes a bath even once in the sacred Ganges water of Bhagavad-gita, for him the dirt of material life is altogether vanquished.
gita su-gita kartavya, kim anyaih shastra-vistaraih
ya svayam padmanabhasya, mukha-padmad vinihsrita
Because Bhagavad-gita is spoken by the Supreme Personality of Godhead, one need not read any other Vedic literature. One need only attentively and regularly hear and read Bhagavad-gita. In the present age, people are so absorbed in mundane activities that it is not possible for them to read all the Vedic literatures. But this is not necessary. This one book, Bhagavad-gita, will suffice, because it is the essence of all Vedic literatures and especially because it is spoken by the Supreme Personality of Godhead.
bharatamrita-sarvasvam, vishnu-vaktrad vinihsritam
gita-gangodakam pitva, punar janma na vidyate
By drinking the Ganges waters of the Gita, the divine quintessence of the Mahabharat emanating from the holy lotus mouth of Lord Vishnu, one will never take rebirth in the material world again. In other words, by devotionally reciting the Gita, the cycle of birth and death is terminated.
sarvopanishado gavo, dogdha gopala-nandanah
partho vatsah su-dhir bhokta, dugdham gitamritam mahat
All the Upanisads are like a cow, and the milker of the cow is Lord Shri Krishna, the son of Nanda. Arjuna is the calf, the beautiful nectar of the Gita is the milk, and the fortunate devotees of fine theistic intellect are the drinkers and enjoyers of that milk.
ekam shastram devaki-putra-gitam
eko devo devaki-putra eva
eko mantras tasya namani yani
karmapy ekam tasya devasya seva
There need be only one holy scripture-the divine Gita sung by Lord Shri Krishna: only one worshipable Lord-Lord Shri Krishna: only one mantra-His holy names: and only one duty-devotional service unto that Supreme Worshipable Lord, Shri Krishna.