Here the preacher rests in a quiet assurance.  He is backed by the promise that God is at work while he is about worship. In this he knows he is a planter. Seeds are sown and fruit will result. Yet, the fruit may not be seen for weeks, months or even years. Still, the preacher rests confident in who God is and what He has promised. God is at work and the preacher glories in that work like a vessel that is used by the hand to be lifted to the thirsty mouth. The preacher is worshipping in all of this.  He is experiencing the pleasure of God upon himself as the Word of God rains down upon the people.