1 Tim 2:6 (NWT) “who gave himself a corresponding ransom for all- this is what is to be witnessed to at its own particular times.”
Matt 20:28 (NWT) “Just as the Son of man came, not to be ministered to, but to minister and to give his soul a ransom in exchange for many.””
The Bible does not contradict itself. Why did Paul say, that Jesus gave himself a ransom “for ALL,” but Jesus said “for MANY?” The simple answer is that “MANY” (or the many) means “ALL” as demonstrated in Romans.
Rom 5:15 (NWT) “But it is not with the gift as it was with the trespass. For if by one man’s trespass many died, the undeserved kindness of God and his free gift with the undeserved kindness by the one man Jesus Christ abounded much more to many.”
In Romans 5:15, the “many” are ALL of Adam’s posterity, just like those who receive Jesus’ free gift. Just as Adam’s posterity is ALL mankind, so those who will benefit from the free gift on Paradise Earth is ALL Mankind. Yes, ALL Mankind will have the future opportunity of a trial for life under favorable conditions on Paradise Earth. This is what the Society taught in the early days at the time of Pastor Russell.
Paul clearly explains what this free gift is for many (ALL) is:
Rom 6:23 (NWT) “For the wages sin pays is death, but the gift God gives is everlasting life by Christ Jesus our Lord.”
The Ransom and Restitution are explained by the founder of the Watchtower Bible and Tract Society (Pastor Charles Taze Russell) here:
This is taken from chapter 9 of volume 1, the Divine Plan of the Ages, of his Studies in the Scriptures series.
You can also view a great video that explains the Ransom here: