The primary meaning of the words "modern," "modernity," with which recent times have baptised themselves, brings out very sharply that feeling of "the height of time" which I am at present analysing. "Modern" is what is "in the fashion, "that is to say, the new fashion or modification which has arisen over against the old traditional fashions used in the past. The word "modern" then expresses a consciousness of a new life, superior to the old one, and at the same time an imperative call to be at the height of one's time. For the "modern" man, not to be "modern" means to fall below the historic level.

Chap. III: The Height Of The Times - The Revolt of the Masses (1929)