Now for a Witness, the doctrinal changes and prophetic failures are immediately dismissed by the thought stopping concept:
"Well, we know better now. The Bible tells us the light would get brighter".
They get this from a verse found in Proverbs.
“But the path of the righteous ones is like the bright light that is getting lighter and lighter until the day is firmly established” (Prov. 4:18).
Proverbs 4 is discussing that righteous people fare better than the wicked. The path of the righteous is the way of wisdom. The path of a person refers to the moral aspect of his or her life. Their life will keep increasing in how it displays God's light. The contrast is with the way of the wicked (4:19), which is the way of “evil” (v. 14). The person whose life is oriented toward evil will stumble through life in deep darkness.
But on this point, we will let Russell himself speak.
Zion's Watch Tower 1881 February pp.3, 188
"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.
The concept of light becoming brighter implies that previous doctrine was correct, but incomplete. The Watchtower Society has promoted many significant doctrines that were later discarded as incorrect. Others have changed back and forth, even reverting to their original position, in each case contradicting a former truth.
So now we'll look at the second weak area for Jehovah's Witnesses, and that's the gospel. The Gospel is our greatest strength and their biggest weakness, because the Watchtower has confused their followers. So we'll look at what approach to take in sharing the gospel, and how to handle the Witness at your door.