Epistula ad Philippenses
Polycarp
Polycarp. The Apostolic Fathers, Volume 1. Lake, Kirsopp, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd. 1912.
in whom, though you did not see him, you believed in unspeakable and
glorified joy,—into which joy many desire to come, knowing that by grace ye are saved, not by works but by the will of God through Jesus Christ.