"We need to obey the faithful and discreet slave to have Jehovah’s approval." Watchtower 2011 Jul 15 p.24 Simplified English Edition
"[A mature christian] does not advocate or insist on personal opinions or harbor private ideas when it comes to Bible understanding. Rather, he has complete confidence in the truth as it is revealed by Jehovah God through his Son, Jesus Christ, and "the faithful and discreet slave." Watchtower 2001 Aug 1 p.14
"Since Jehovah God and Jesus Christ completely trust the faithful and discreet slave, should we not do the same?" Watchtower 2009 Feb 15 p.27
"To act consistently with our baptism for life and into the Greater Noah we must submit to and cooperate with that slave and its legal instrument, the Watch Tower Society." Watchtower 1959 Oct 1 p.583
For many decades, the Slave included all "anointed" Witnesses, but in 2012 the Governing Body assumed this role upon themselves alone. For several years the Governing Body had been making statements that increased its own authority.
"The anointed and their other sheep companions recognize that by following the lead of the modern-day Governing Body, they are in fact following their Leader, Christ." Watchtower 2010 Sep 15 p.23