Brighter or Changed
Regularly, Watchtower light is not brighter, it is vastly different than the past
Proverbs 4 identifies that righteous people fare better than the wicked, and not prophetic of the Watchtower Society. However, let us entertain the idea that within this passage there is the prophetic foreshadowing that God progressively reveals truth to his people during the time of the end. This concept cannot apply to Watchtower history, as Watchtower doctrine has not refined but changed. Consider whether the following change is really a matter of doctrinal light getting lighter:
Imagine being the Witness parent of a child that needed a kidney transplant in 1970. Although the Awake! 1949 Dec 22 had described transplants as "wonders of modern surgery", in 1967 God revealed that transplants were wrong in his eyes. The Watchtower 1967 Nov 15 pp.702-704 stated that being now "enlightened by God's word" God's people understood that transplants are against divine principles and cannibalistic. The parents must sincerely have believed they were putting Jehovah first when watching their child die, refusing them the opportunity of possible survival through a transplant. How would that parent feel on reading the Watchtower 1980 Mar 15 p.31 - "There is no Biblical command pointedly forbidding the taking in of other human tissue. It is a matter for personal decision. " The enlightenment of 1967 had proved to be dark, harmful and in need of later correction, a regressive doctrine that resulted in the unnecessary death of members. When a doctrine changes and then reverts back to the original position this is not evidence of light getting brighter, it is evidence of a lack of Holy Spirit directing the Governing Body.
The concept of light becoming brighter implies that previous doctrine was correct, but incomplete. Russell eloquently wrote the following truism that:
"If we were following a man undoubtedly it would be different with us; undoubtedly one human idea would contradict another and that which was light one or two or six years ago would be regarded as darkness now;… But with God there is no variableness, neither shadow of turning, and so it is with truth; any knowledge or light coming from God must be like its author. A new view of truth never can contradict a former truth. "New Light" never extinguishes older "light" but adds to it…"