Incremental, Barely Discernable Change

Basilique Saint-Pierre Vatican domeFrom a discussion of the Galileo affair:

It is a matter of historical record that additions or deletions to Roman church doctrine are carefully executed over several generations, the changes being thus less noticeable than if made quickly.

~ Ian T. Taylor, In the Minds of Men: Darwin and the New World Order, Expanded & Updated Sixth Edition, page 25

It seems to me that a similar thing has been going on with certain modern English Bible translations, only in those cases, the changes seem to be happening more and more frequently.