At the beginning of my sermon series through 1 Timothy I leaned on Kostenberger and Knight, but about halfway through I stumbled upon Yarbrough's work. It has become the most significant to me in sermon preparation. While I still consult (and appreciate) the others (along with Ryken), this commentary blends together the scholarly and sermonic in a way that was unexpectedly balanced. Ryken is very sermonic, Kostenberger's is a fine summary, and Knight pulls apart some of the Greek (at a low to mid-level Greek student level) and offers fine scholarly considerations. But Yarbrough pulls all these threads together in a wonderfully balanced and ever-so-helpful way.