  Particularists suppose that this doctrine is true for reasons in general, so that its application to moral reasons is just part and parcel of a larger story. For an example that comes from a non-moral context, suppose that it currently seems to me that something before me is red. Normally, one might say, that is a reason (some reason, that is, not necessarily sufficient reason) for me to believe that there is something red before me. But in a case where I also believe that I have recently taken a drug that makes blue things look red and red things look blue, the appearance of a red-looking thing before me is reason for me to believe that there is a blue, not a red, thing before me. It is not as if it is some reason for me to believe that there is something red before me, but that as such a reason it is overwhelmed by contrary reasons. It is no longer any reason at all to believe that there is something red before me; indeed it is a reason for believing the opposite.