What was the special Parousia and Epiphany work?

Luke 12:37: Blessed are those servants, whom the lord when he cometh shall find watching: verily I say unto you, that he shall gird himself, and make them to sit down to meat, and will come forth and serve them.

"Since in the Parousia it was due to complete the development of the Little Flock, as the special Parousia work, naturally the Truth teachings of that time centered in Christ and the Church. And since in the Epiphany it is due to develop the Great Company and the Youthful Worthies, naturally the Truth teachings of this time center in these two classes. . . . And as things not due cannot be seen before they are due, so during the Parousia, specifically Epiphany truths could not be seen. Thus when the Parousia ended, 1914, all error was removed from the Parousia truths, i.e., the truths needed for the development of the Little Flock. But by the same token not all error was by 1914 removed from matters pertinent, to the Great Company and the Youthful Worthies. This will have taken place by 1954, each of these things being set forth respectively by the purification of the mother of a son in forty, and that of a mother of a daughter in eighty days (Lev. 12) . . . Hence as the Epiphany advances the immaturities on the Great Company and the Youthful Worthies of the Parousia and of the past Epiphany times give way to clearer light, even as this same principle operated during the Parousia as to its immaturities. Thus 'the path of the just is as a shining light that shineth more and more unto the perfect [full] day' (Prov. 4: 18). Accordingly, no new Truth for the development of the Little Flock for the Kingdom has come since the Parousia's end; all of it that has since come is for the development of the Great Company and the Youthful Worthies."

--Your Brother and Servant, PAUL S. L. JOHNSON. E5, p. iv.