Just like a skilled person puts a foundation in the ground before he builds a house, as a result of God kindly helping me [MET], I was the first one who declared the message about Christ to you. And, just like others build a house on its foundation, there were others who later taught you more about Christ. But just like each person who builds a house must be careful about what materials he uses to build it [MET], each person who teaches God’s truth must be careful about what he teaches.