Have no fellowship - Have no religious connection whatever with heathens or their worship.
Unfruitful works of darkness - Probably alluding to the mysteries among the heathens, and the different lustrations and rites through which the initiated went in the caves and dark recesses where these mysteries were celebrated; all which he denominates works of darkness, because they were destitute of true wisdom; and unfruitful works, because they were of no use to mankind; the initiated being obliged, on pain of death, to keep secret what they had seen, heard, and done: hence they were called ̔ , unspeakable mysteries - things that were not to be divulged. That the apostle may refer to magic and incantations is also probable, for to these the Ephesians were greatly addicted. See the proofs in the notes on Acts 19:19.
Rather reprove them - Bear a testimony against them; convince them that they are wrong; confute them in their vain reasons; reprove them for their vices, which are flagrant, while pretending to superior illumination. All these meanings has the Greek word , which we generally render to convince or reprove.
DISCLAIMER: Church of the Great God (CGG) provides these resources to aid the individual in studying the Bible. However, it is up to the individual to "prove all things, and hold fast to that which is good" (I Thessalonians 5:21). The content of these resources does not necessarily reflect the views of CGG. They are provided for information purposes only.