Acts 13

(2-3) While they were worshiping the Lord and fasting, the Holy Spirit said, "Set apart for me Barnabas and Saul for the work to which i have called them." So after they had fasted and prayed, they placed their hands on them and sent them off.
To be set apart means to be dedicated for a special purpose. Not all of us are called to have extraordinary lives but we should dedicate our money, time and efforts for God's work. Giving financial aid to missionaries etc.

(10) You are a child of the devil and an enemy of everything that is right! You are full of all kinds of deceit and trickery. Will you never stop perverting the right ways of the Lord?
When necessary we have to be brutal with the gospel. Confronting a fellow believer or neighbour can sometimes be the most loving thing to do.