Freuen wir uns all in ein . [Prayer for Unity .] This, the first hymn of the Bohemian Brethren, was composed in 1457 at Lhotka, in celebration of the foundation of the Unity. Bishop Blahoslav (De Cantionali, 1561) names as author Matthias Konvaldsky, and adds: "licet hanc cantilenam multi tribuunt alii cuidam bono viro, qui vocabatur Gabriel Komarovsky." Originally written in Bohemian, it began, "Radujme se vzdy spoleene," and was first published in the Bohemian Brethren's Hymn Book, 1501, in 13 st. The translation into German Freuen wir, &c.) is by M. Weisse, is a free version of 12 stanzas, first appeared in the New Geseng buchlen, 1531, and is reprinted in Wackernagel,iii.,No. 357. An English translation from Weisse ("With unity of heart and voice") appears in Benham's Notes on the Origin and Episcopate of the Bohemian Brethren, London, 1867, p. 51. [Rev. J. T. Mueller]
--John Julian, Dictionary of Hymnology (1907