For nothing is secret, that shall not be made manifest; neither any thing hid, that shall not be known and come abroad.
The former paragraph began with an account of Christ's industry in preaching (Luk 8:1); this begins with an account of the people's industry in hearing, Luk 8:4. He went into every city, to preach; so they, one would think, should have contented themselves to hear him when he came to their own city (we know those that would); but there were those here that came...
Commenting on Luke 8:4-21
Take heed therefore how ye hear,.... That ye hear not in a careless and negligent manner, since what truths and doctrines ye now hear with the ear, are to be preached by you unto others: for whosoever hath; that is, hath knowledge of the doctrines of the Gospel, and hath gifts and abilities to preach them to others: to him shall be given; more knowledge...
Verse 17. , and Mr 4:22-25 (v) "nothing is secret"