The Nuttall Encyclopedia
Open Secret, the
The secret that lies open to all, but is seen into and understood by only few, applied especially to the mystery of the life, the spiritual life, which is the possession of all.
Wood, James, ed. Entry for 'Open Secret, the'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/o/open-secret-the.html. Frederick Warne & Co Ltd. London. 1900.