2. The second main theme is the question of what he called "Reason and Unreason" in human nature and society. He criticised the traditional view widely propagated from Aristotle through Hume to Bertrand Russell, that the main functions of reason in human affairs lie in the clarification, systematisation and control of impulse and feeling, and the discovery of means to their fulfilment. He contended that reason and feeling should not be held to be in opposition, or reason as the slave of the passions, but that reason could play a significant role in motivating action and directing feeling and conation. He sums up his view as follows: