God is a spirit, and they that adore Him must adore Him in spirit and in truth.
 Thomas Aquinas, Summa Theologica (1274). copy citation

add
Author Thomas Aquinas
Source Summa Theologica
Topic truth God
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/18755/pg18755-images.html

Context

“THIRTEENTH ARTICLE [II-II, Q. 83, Art. 13] Whether Attention Is a Necessary Condition of Prayer? Objection 1: It would seem that attention is a necessary condition of prayer. It is written (John 4:24) : "God is a spirit, and they that adore Him must adore Him in spirit and in truth." But prayer is not in spirit unless it be attentive. Therefore attention is a necessary condition of prayer. Obj. 2: Further, prayer is "the ascent of the mind to God" [*Damascene, De Fide Orth. iii, 24]” source