Many people lionize reason above all other human attributes but the problem with reason is that it can be used to justify anything, as it is totally free of any moral grounding. When everything is seen as relative and there are no moral absolutes then everything is up for grabs and, therefore, anything goes! We see this operating everyday when people use reason to justify immoral acts. For almost any action, good or evil, can be justified with recourse to reason. Therefore, we need more than reason if we are to live a productive life that is helpful and not harmful to our fellow beings! We need moral values that come from our feeling nature and our ability to empathize, in addition to our ability to reason things out.
See also: The end of the world, not the earth by Barry Long