Charles E. Whisnant, November 15, 2009. From Romans 1:11-12 Spiritual Fruit Purpose of Ministry 1 of 4.
Paul is saying the preaching and teaching is not the end in its self, but the means to the end. The desired result is seeing produce in the believer fruit of love and labor and service unto the LORD.
While I really love preaching and teaching, its only the means whereby people might get the Word of God which in turn might strengthen them to love Him and Worship Him and Serve Him.