Francis A. Schaeffer on Neo-OrthodoxyThe God Who Is There, (Downers Grove, IL: InterVarsity Press, 1968), p79.
[T]he scientific symbol has become an important tool for writing increasingly lengthy formulae with greater accuracy. In other words, it has value according to the sharpness of its definition. But the new theology uses the concept of symbol in exactly the opposite way. The only thing the theological and scientific uses have in common is the word symbol. To the new theology, the usefulness of a symbol is in direct proportion to its obscurity. There is connotation, as in the word god, but there is no definition. The secret of the strength of neo-orthodoxy is that these religious symbols with a connotation of personality give an illusion of meaning, and as a consequence it appears to be more optimistic than secular existentialism.