Hume aimed to continue the empirical enquiry begun by Locke to criticise trust in reason and question the nature of causality. ‘Aims and Methods’ discusses Hume's attempts to create a satisfactory philosophical system and use his scepticism to dispel superstition and discredit religious belief. Applying the processes of Natural Science to Philosophy, he asked what materials the mind was furnished with and how it could use them. Perception consisted of fleeting impressions, which the mind used to create ideas, although this gives images too central a role in the formation of ideas. Hume then considered the relation between ideas as well as objects that fall under the ideas.