'Keen' in the Bible

who was a friend of the Proconsul Sergius Paulus. The Proconsul was a man of keen intelligence. He sent for Barnabas and Saul, and asked to be told God's Message.

For Titus not only accepted our appeal, but was so very interested in you that he has gone to visit you of his own accord.

And this I pray, that your love may abound more and more [displaying itself in greater depth] in real knowledge and in practical insight,