Edited by William A. Jurgens.
Collegeville, MN: Liturgical Press, 1970-1979. 3 volumes.
English-language translations of the 2388 most important
patristic passages needed for theological study. Arranged in chronological order with a detailed subject index.
Only volume 3
is available online on the Internet Archive, a trusted source, but one for which it is necessary to create a free account and login.