The Book of Isaiah has been immensely influential in the formation of Christianity, from the devotion to the Virgin Mary to anti-Jewish polemic, medieval passion iconography, and modern Christian feminism and liberation theology. The regard in which Isaiah was held was so high that the book was frequently called "the Fifth Gospel", the prophet who spoke more clearly of Christ and the Church than any others. Its influence extends beyond the Church and Christianity to English literature and to Western culture in general, from the libretto of Handel's Messiah to a host of such everyday phrases as "swords into ploughshares" and "voice in the wilderness".