David Lang, the Accordance guru, has a blog entry today on a preacher talking about the word καῖρος in Gal. 4:4 -- about what a special word that is. Of course, Gal 4:4 talks about the πλήρωμα τοῦ χρόνου and the word καῖρος doesn't appear there at all. Check it out: "That's Right, Preacher Man! I Am Dangerous" (http://www.accordancebible.com/That%27s ... -Dangerous).
εἰ οὖν τὸ φῶς τὸ ἐν σοὶ σκότος ἐστίν, τὸ σκότος πόσον.