The Plumb is a symbol of uprightness of conduct. In Freemasonry it is associated with the plumb line which the Lord promised Amos He would set in the midst of his people of Israel, symbolizing His standard of divine righteousness. The plumb line in the midst of a people should mean that they will be judged by their own sense of right and wrong and not by the standards of others. Freemasons, understanding the Plumb, are to judge each brother by his own standards and not those of another. When the plumb line is thought of in this way, it becomes a symbol of an upright life and of the conscience by which each must live. (GA GL, Mentors Manual, 2010, pg. 28; (Same thought also in these sources: NM GL,Masonic Etiquette, 2005, pg. 3; VA GL, Mentor's Manual, 2002, pg. 35; NE GL, Mentoring Manual, 2006, pg. 47; MS GL, Mentor's Manual, 1986, pg. 16; MSA, Pocket Encyclopedia of Masonic Symbols; CA GL, Mentoring Program, 2004, pg. 89; UT GL, FC Education Plan, 2007, pg. 4; IL GL, Intender Program, FC Guidebook, 2003, pg. 25; TN GL, BMEC-FC, 2003, pg. 8))