Why does Paul use the word 'wherefore' so often?
Paul uses 'wherefore' frequently because his writing is progressive revelation, constantly building. Unlike Peter's preaching or the Lord's ministry, Paul repeats it: after covering ground he says 'wherefore' or 'therefore,' advances further, stops, and says it again, marking each stage of unfolding truth.
Les explains that Paul likes to use the word 'wherefore' over and over. He notes that he does not think that word is found in Peter's preaching or even in the Lord's ministry, but Paul uses it repeatedly. Why? Because Paul's is a progressive revelation. He is constantly building. When he has covered a point, he says 'wherefore' or 'therefore,' then goes a little further, stops, and says 'wherefore' or 'therefore' again. In the immediate context, this 'wherefore' introduces the conclusion that because of all Paul unveiled in previous chapters, thou art no more a servant or a slave, not even a little child under tutors, but a son, a full-blown son, in full partnership with the Father.