(4) Now is the time for any who may be putting their trust in secular education, material things, or human institutions to adjust their thinking.
By all means we should follow this advice. The WTBTS is a human institution. All of their corporations have human presidents, board members, stockholders etc.
What they really mean is that people should only go to the Elders for their thinking readjustments and not be reading the bible on their own.
Here an elder and ministerial servant is helping a member who was questioning the wisdom of rejecting the New Covenant in light of the changes to the "generation" doctrine to mean an indefinite period of time. After, they were done, he had no more questions.