Emile Burnof (1821-1907) author of La science des religions and Dictionnaire classique sanscrit-français and Essai sur le Veda, ou Introduction a la connaisance de l'Inde says:
The Bhagavad Gita was "probably the most beautiful book which has ever come from the hand of man."
(source: The Fragrance of India - By Louis Revel p. 163).