Mankind is divided into rich and poor, into property owners and exploited; and to abstract oneself from this fundamental division; and from the antagonism between poor and rich means abstracting oneself from fundamental facts. ↗
Abstract words such as glory, honor, courage, or hallow were obscene beside the concrete names of villages, the numbers of roads, the names of rivers, the numbers of regiments and the dates. ↗
Our intelligence cannot wall itself up alive, like a pupa in a chrysalis. It must at any cost keep on speaking terms with the universe that engendered it. ↗
Remember that every science is based upon an abstraction. An abstraction is taking a point of view or looking at things under a certain aspect or from a particular angle. All sciences are differentiated by their abstraction. ↗