translate English to French: They embrace equally the past ages of civilization and economy, as also the whole of modern reality and future phases of development, which are perhaps already to some extent beginning to take shape, though for the most part they are still almost unknown to man and hidden from him.
Tous et chacun, dans une mesure appropriée et avec un nombre incalculable de modalités, prennent part à ce gigantesque processus par lequel l'homme «soumet la terre» au moyen de son travail.