A connection is then forged between voluntary behavior and desire. Arguably, a behavior is only voluntary if it is caused by being aimed at. On one theory of desire, aiming at p entails desiring something (either p itself, or something to which p is taken to be a means). It follows that a rational agent’s recognition of a reason entails the presence of a relevant desire. This does not yet rule out externalism, which is compatible with this result if any of a number of different claims are true.