From the lack of any form of similitude or affinity between object/sensation, and sensation/idea, it follows that there is no such relation which holds between an idea and an external (material) object. From this lack of similitude, Le Grand concluded that adventitious ideas (coming from material objects outside us) must be innate or inbred in the mind. For, if the external object is not like the idea we form of it, then the only explanation remaining is that the mind is responsible for it. Like