John Wesley does not use the technical terms “theosis” or “deification” anywhere in his published sermons, journals, or A Plain Account of Christian Perfection, so there are no Wesley quotes that explicitly employ those words.[1][2][3]

What you can quote, instead, are his key formulations that later interpreters read as functional theosis language—for example:

– “A Christian is so far perfect as not to commit sin.” (Sermon, “Christian Perfection.”)[2]
– Entire sanctification as “the renewal of the heart in the whole image of God, the full likeness of Him that created it.” (A Plain Account of Christian Perfection.)[4][2]
– Perfection as “that love of God and our neighbour, which implies deliverance from all sin.” (A Plain Account of Christian Perfection.)[1][2]

Modern studies (e.g., the “Theosis & Sanctification: John Wesley’s Reformulation of Deification” material summarized on Theopedia and in the Partakers of the Divine Nature volume) argue that these image‑renewal and “partakers of the divine nature” themes amount to a Wesleyan reformulation of deification, but the explicit vocabulary is interpretive, not Wesley’s own.[3][5][6]

If you want, I can assemble a short primary‑source packet of 6–8 Wesley excerpts that are most serviceable for teaching “Wesley and theosis,” clearly flagged as “analogous but not terminologically explicit.”

Sources
[1] Partakers of the DIvine Nature: Theosis and Christian Perfection https://aniceplace.wordpress.com/2008/07/26/partakers-of-the-divine-nature-theosis-and-christian-perfection/
[2] Christian perfection – Wikipedia https://en.wikipedia.org/wiki/Christian_perfection
[3] Theosis | Theopedia https://theopedia.com/theosis
[4] [PDF] Wesley on Personal Holiness – The Methodist Church https://www.methodist.org.uk/documents/19723/wc_Eur_Wesley_on_Personal_Holiness_Lars_Svanberg.pdf
[5] (PDF) Partakers of the Divine Nature: The History and Development … https://www.academia.edu/58867870/Partakers_of_the_Divine_Nature_The_History_and_Development_of_Deification_in_the_Christian_Traditions_Edited_by_Michael_J_Christensen_and_Jeffery_A_Wittung_Deification_and_Grace_Introductions_to_Catholic_Doctrine_By_Daniel_A_Keating_Deification_in_the_Eastern_Orthodox_Tradition_A_Biblica_
[6] Partakers of the Divine Nature : The History and Development of … https://cincinnatistate.ecampus.com/partakers-divine-nature-history/bk/9780801034404
[7] Partakers of the Divine Nature – Baker Publishing Group https://bakerpublishinggroup.com/products/9780801034404_partakers-of-the-divine-nature
[8] John Wesley on Theosis – Michael J. Christensen, ‘Donkey’s Delight’ http://donkeysdelight.blogspot.com/2019/09/john-wesley-on-theosis.html
[9] Partakers of the Divine Nature: The History and Develop… https://www.goodreads.com/book/show/2534103.Partakers_of_the_Divine_Nature
[10] John Wesley and the Imitation of Christ – Conciliar Post https://conciliarpost.com/theology-spirituality/john-wesley-and-the-imitation-of-christ/
[11] THE MYSTICAL PATH OF CHRISTIAN THEOSIS: Becoming … https://www.facebook.com/groups/2419255661497957/posts/24199203163076560/
[12] On the 250th anniversary of A plain account of Christian perfection http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S1017-04992018000100011
[13] [PDF] Understanding Christian Perfection and its Struggle with … https://place.asburyseminary.edu/cgi/viewcontent.cgi?article=1200&context=asburyjournal
[14] What led John Wesley to write ‘Plain Account of Christian Perfection’? https://www.facebook.com/groups/globalmethodistchurch/posts/1394376994895016/
[15] [PDF] Reading Wesley’s Theology Through the Lens of Process Thought https://digitalcommons.du.edu/cgi/viewcontent.cgi?article=1006&context=etd