This innovative new volume analyses the role of emotions in knowledge acquisition. It focuses on the field of philosophy of emotions at the exciting intersection between epistemology and philosophy of mind and cognitive science to bring us an in-depth analysis of the epistemological value of emotions in reasoning.  With twelve chapters by leading and up-and-coming academics, this edited collection shows that emotions do count for our epistemic enterprise. Against scepticism about the possible positive role emotions play in knowledge, the authors highlight the how and the why of this potential, lucidly exploring the key aspects of the functionality of emotions. This is explored in relation to: specific kinds of knowledge such as self-understanding, group-knowledge and wisdom; specific functions played by certain emotions in these cases, such as disorientation in enquiry and contempt in practical reason; the affective experience of the epistemic subjects and communities.