Obedience, blessings of, [476].
Œcolampadius, character and work of, [182-184].
death of, [212].
Offerings, see [Sanctuary].
Olivetan, cousin of Calvin, [220].
One hundred and forty-four thousand, song of, [648].
Open door, see [Door of mercy].
Oppression, see [Dark Ages]; [Papacy]; [Persecution].