Blaise Pascal's famous Pens es (Thoughts) is, in reality, a collection of notes he made for a book he never wrote. Many of the thoughts are fragmentary in nature, and the sectionalising and numbering was devised by a later editor. Yet they contain the key ideas of his religious philosophy, including his famous wager, as well as many other insights and ideas such as his celebrated comment on Cleopatra's nose. This edition contains notes, a topical index, and T. S. Eliot's introduction. Eliot says "Pascal is one of those writers who will be and who must be studied afresh by men in every generation.