(The). Those who are known to God alone as His sons and
daughters by adoption and grace. (See Church Visible.)
“Oh, may I join the choir invisible.” G. Eliot.
The Church on earth means the whole body of believers, who are said
to be “waging the war of faith” against “the world, the flesh, and the
devil.” It is therefore militant, or in warfare. (See
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894