"The opening up of this new continent has induced a revolution in philosophy. That is a law: philosophy is always linked to the sciences. Philosophy was born (with Plato) at the opening up of the continent of Mathematics. It was transformed (with Descartes) by the opening up of the continent of Physics. Today it is being revolutionized by the opening up of the continent of History by Marx. This revolution is called dialectical materialism. Transformations of philosophy are always rebounds from great scientific discoveries. Hence in essentials, they arise after the event. That is why philosophy has lagged behind science in Marxist theory. There are other reasons which we all know about. But at present this is the dominant one."