The greatest adoption is that which is described in the Book of Romans and the Book of Ephesians.

" ...Ye have received the spirit of adoption, whereby we cry, Abba, Father."

" ...Unto the adoption of children by Jesus Christ to Himself, according to the good pleasure of His Will."

It should also be considered how we respond to our adoption, as it may make a world of difference ...and whether we feel more a part of this world, or apart from this world.