“The question whether objective truth can be attributed to human thinking is not a question of theory but is a practical question. Man must prove the truth — i.e. the reality and power, the this-sidedness of his thinking in practice. The dispute over the reality or non-reality of thinking that is isolated from practice is a purely scholastic question”. (Marx, Second Thesis on Feuerbach.) Alan Woods examines the revolutionary advances made by Marx in the field of philosophy.