high notionist:
a notionist was one who held ‘extravagant religious opinions’ (OE 1.):   John Bunyan defined a notionist as ‘one who knows the scripture but only “in the notion, and hast not the power of the same in [his] heart”, having a head “full of the knowledge of the Scriptures,” but a heart “empty of sanctifying grace”’. ¹    Cf. professor.
High could be used to indicate someone ‘extreme in opinion (esp. religious or political)’ (OED 15.a.).

1.    John Bunyan, ‘Some Gospel Truths Opened’, quoted in Thomas H. Luxon, ‘“Not I, But Christ”: Allegory and the Puritan Self’, English Literary History 60.4, pages 800-937, at 901.    Return