Luke 11:33-36 NASB
“No one lights a lamp and puts it away in a cellar nor under a basket, but on the lampstand, so that those who enter may see the light. Your eye is the lamp of your body; when your eye is clear, your whole body also is full of light; but when it is bad, your body also is full...
KJV Dictionary Definition: MYS'TERY, n. L. mysterium; Gr. a secret. This word in Greek is rendered also murium latibulum; but probably both senses are from that of hiding or shutting; Gr. to shut, to conceal.
1. A profound secret; something wholly unknown or something kept cautiously concealed...