New Delhi, March 29 -- Jean-Paul Sartre was a French philosopher, novelist, playwright, screenwriter, literary critic, and political activist. He is widely regarded as one of the most influential thinkers of the 20th century and the leading figure in existentialism.

Quote of the Day: "War, when all's said and done, is a concrete idea that contains within itself its own destruction and that accomplishes this by an equally concrete dialectic. . . . The essence of war will be realized concretely the day war becomes impossible."

This quote comes from Jean-Paul Sartre's War Diaries: Notebooks from a Phoney War, 1939-1940 , which was originally published in French, Carnets de la drole de guerre. It appears in his philosophical reflections wri...