Sir Issac Newton's analysis of 1John 5:7-8 and also 1Tim 3:16. An incredible amount of detail on the various manuscripts and sources that did or didn't have "three in heaven" in their version and why he feels the evidence leads to the conclusion that there was a corruption of the scripture.

To follow the argument, it does help if one has done some reading or studying of Bible history and of the ancient manuscripts. Else when he speaks in XVI of "Yes, truly, those Arians were crafty knaves, that would conspire so cunningly and slily all over the world at once" ... to razed the passage out of their books - provides a hearty guffaw if one has knowledge of Arianism