Sri Ramanuja wrote nine works in Sanskrit on the philosophy of Vishishtadvaita. Of these, the Vedartha Samgraha occupies a unique place inasmuch as this work takes the place of a commentary on the Upanishads. The book contains the original Sanskrit text along with a running translation by S. S. Raghavachar, and is sure to be useful to all students of Indian philosophy.
The book one must read to learn natural sciences is the book of nature. The book from which to learn religion is your own mind and heart.
-Swami Vivekananda