Chayei Nefesh
An interesting defense, and history of, the practice of holding close to the tzadikkim (hiskashrus hatzaddikim). Written by Rav Gedaliah Kenig, z”l, a major 20th century Breslov teacher.
http://www.nachalnovea.com/breslovcenter/articles/Chayei_Nefesh_Part_I.pdf
http://www.nachalnovea.com/breslovcenter/articles/Chayei_Nefesh_Part_II.pdf