Summary
This quote implies that rationality and logical thinking have always been present in human beings, but their expression and application may not have always been reasonable or sensible. It suggests that throughout history, people have had the capability to think critically and use reason, but their conclusions and beliefs may have been influenced by biases, emotion, or flawed reasoning. Therefore, while reason itself may be constant, its manifestation can vary in terms of its coherence and logical validity.
By Karl Marx