Watchtower 9/16/2010 pg. 27 paragraph 9
"I am he who searches the kidneys and hearts, and I will give to you individually according to your deeds." (Rev. 2:23) That statement indicates that Christ observes not only the collective conduct of each congregation but also the lifestyle of its individual members.
Jesus commended Christians in Thyatira "who did not get to know the ‘deep things of Satan.' " (Rev. 2:24) Today, he likewise approves of those, young or old, who refrain from delving into the "deep things of Satan" by means of the Internet or violent video games or by indulging in permissive human reasonings.