 Regarding the normative profile of understanding and its relation to knowledge, others have argued that understanding is not vulnerable to defeat, especially in the face of known counterevidence, in the way that knowledge is (Hills 2016; Dellsén 2017). Dellsén for instance argues that if I come to believe or grasp that a car engine works a certain way, and it really does work that way, then my understanding of how the engine works is secure even if I have (misleading) evidence that the person telling me about the engine is unreliable (Dellsén 2017). To these philosophers, this provides still another reason for thinking that understanding is not a species of knowledge.