"The most fundamental principle is contained in the Savior’s commandment that we “judge not unrighteously, … but judge righteous judgment” (JST, Matt. 7:1–2, footnote a; see also John 7:24; Alma 41:14). Let us consider some principles or ingredients that lead to a “righteous judgment.”

Dallin H. Oaks
"Judge Not, Judging"
1999

http://www.lds.org/ensign/1999/08/judge-not-and-judging