Charles Ellicott Commentary Luke 12:3

"Wherefore whatsoever ye have said in the darkness shall be heard in the light; and what ye have spoken in the ear in the inner chambers shall be proclaimed upon the housetops." — Luke 12:3 (ASV)

Therefore whatever you have spoken in darkness.—See Note on Matthew 10:27. There is, it will be noted, a difference of the same character as in the last verse. As recorded in Saint Matthew, it is What I tell you in darkness, that speak you in light. The disciples were warned of their responsibility and duty as hearers, bound to teach publicly what had been heard in secret.

Here they are told of their responsibility as teachers. Every word, however secret, spoken in darkness, in the closet or cabinet, which was the symbol of secrecy (see Note on Matthew 6:6); every whisper of false security or groundless fear, spoken in the ear of sinner or of penitent, would one day be made manifest, as in the presence of men and angels.