May be is rather may prove or show yourselves to be. Harmless, lit., unmixed. See on Mat 10:16. Better, guileless. Blameless in the sight of others, guileless in your own hearts.
Sons of God (τέκνα)
Rev., better, children. See on Joh 1:12. Compare Deu 32:5.
Without rebuke (ἄμωμα)
Rev., correctly, without blemish. See on Col 1:22. The word is epexegetical of the two preceding epithets, unblemished in reputation and in reality.
Crooked and perverse (σκολίας - διεστραμμένης)
Crooked, see on untoward, Act 2:40; see on froward, 1Pe 2:18. Perverse, lit., warped, twisted. See on Mat 17:17; see on Luk 23:14.
Ye shine (φαίνεσθε)
Rev., more correctly, ye are seen. Compare Mat 24:27; Rev 18:23, A.V., where the same error occurs. Shine would require the verb in the active voice, as Joh 1:5; Joh 5:35.
Lights (φωστῆρες)
Only here and Rev 21:11, see note. Properly, luminaries. So Rev., in margin. Generally of the heavenly bodies. See Gen 1:14, Gen 1:16, Sept.
In the world
Connect with ye are seen, not with luminaries. The world, not only material, but moral. For the moral sense of κόσμος world, see on Joh 1:9.