how do you know

when it is God speaking to you, or your own inner desires? There is something that I have been praying about, and I can't seem to decide if God is giving me the answer, or if it is the desire of mine that is overpowering his voice. There is a choice that I have to make. It's not life or death, or even really terribly significant. I have to give a yes or no answer, and I don't feel a peace about either one. So, pray if you will that I will find the 'right' answer.