The upanisads are the records of the great spiritual experience of the seers and saints of ancient India. They point out the possibility of realizing the supreme Goal by every sadhaka. The major texts are of great value in disciplining the mental, moral, and physical activities of the individual to whatever creed he belongs. These profound works forming the integral core of perennial philosophy are eternally valuable to man. The need of these texts is more in modern times when man is tossed between conflicting desires, goal, ideals, and ways of life. They must be made to speak to the modern man is a medium he can easily comprehend. This is what Swami Gabhirananda has achieved in this work. In a simple language, freed from technicalities of a philosophical or a theological discourse, the Swamiji has offered us this great treasure. After going through his version, one would long to cleave to the text for ever. More of such is the need of the hour.