David. R. Goodworth explores saying 6.16/Th109 from his book 'The Gospel of Thomas: Evolution'.

Jesus said, “The kingdom is like a man who had treasure hidden in his field which he knew nothing about. After he died, he left it to his son. The son also did not know, he accepted the field and sold it. The person who bought it came and ploughed it and found the treasure. He began to lend money at interest to whoever he chose.”