Johan Mau­r­er lifts up a 1974 pub­li­ca­tion by John Yungblut:

Grant­ed, as a deep stu­dent of Carl Gus­tav Jung and Pierre Teil­hard de Chardin, Yung­blut’s def­i­n­i­tions of those three adjec­tives may not have exact­ly been old-school. This par­tic­u­lar­ly goes for his reflec­tions on the word “evan­gel­i­cal.” But the dynam­ic con­ver­sa­tion among these qual­i­ties — dif­fer­ent def­i­n­i­tions and all — may be vital if Friends are to grow in use­ful­ness to the Body of Christ, and to those who’ve not yet been convinced. 

https://​blog​.canyoube​lieve​.me/​2​0​1​8​/​1​0​/​q​u​a​k​e​r​i​s​m​-​o​f​-​f​u​t​u​r​e​.​h​tml