Puritan Thomas Watson explains how a congregation is to encourage it's pastor:
"Encourage God’s ministers by your fruitfulness under their labors. When ministers are upon the ‘mount’, let them not sow upon the rocks. What cost has God laid out upon this city! Never, I believe, since the apostles’ times, was there a more learned, orthodox, powerful ministry than now. God’s ministers are called stars (Revelation 1:20). In this city every morning a star appears, besides the bright constellation on the Lord’s Day.In short - God's people - Be fruitful!
Oh you that feed in the green pastures of ordinances—be fat and fertile. You who are planted in the courts of God, flourish in the courts of God (Psalm 92:13). How sad will it be with a people, who shall go laden to hell with Gospel blessings! The best way to encourage your ministers is to let them see the travail of their souls in your new birth."