I grew up thinking that entire sanctification was final sanctification.  Wrong!  Entire is used only once in the NT in regard to sanctification.  There, it has nothing to do with final sanctification but with comprehensive sanctification, involving the whole person, body, soul and spirit.  There is no room for a dualistic sanctification where only the heart and spirit is cleansed.   Biblical sanctification gathers the whole person into a relationship of belonging entirely to God.  The God who calls is the one who works in us to bring it to pass.

“Now may the God of peace Himself sanctify you entirely; and may your spirit and soul and body be preserved complete, without blame at the coming of our Lord Jesus Christ.  Faithful is He who calls you, and He also will bring it to pass.” 1 Thessalonians 5:23-24 (NASB)