Can we decide to trust? Sometimes, yes. And when we do, we need not believe that our trust will be vindicated. This paper is motivated by the need to incorporate these facts into an account of trust. Trust involves reliance; and in addition it requires the taking of a reactive attitude to that reliance. I explain how the states involved here differ from belief. And I explore the limits of our ability to trust. I then turn to the idea of (...) trusting what others say. I suggest that we sometimes decide to trust people to be sincere and knowledgeable; and that having taken this attitude towards them, we come to believe what they say. I spell out some consequences that this has for an account of testimony, and for van Fraassen's decision theoretic principle of Reflection. (shrink)

How is the possibility of promising to be explained without circularity? Appeal is made to the role of natural inclinations in linguistic behaviour, which presupposes truth telling and promise keeping, and also to the social functions of human language which go beyond signalling and transmitting information and which are prior to any explicit conventions. Although promises are broken and lies told, we all have the right to feel resentment when these things happen.