This section, Galatians 4:12-20, shows us principles for the attitude for the pastor towards the people in his church.
He must be willing to serve and sacrifice for his people.
He must tell them the truth.
He must love his people deeply; never for a selfish motive.
He must desire to see more than mere excitement, but zeal for good things.
He must desire to form Jesus in them, not himself in them.