[1st.] Slaves take liberty from duty; children have liberty in duty. There is not a greater mistake in the world, than that the liberty of sons in the house of God consists in this, — they can perform duties, or take the freedom to omit them; they can serve in the family of God (that is, they think they may if they will), and they can choose whether they will or no. This is a liberty stolen by slaves, not a liberty given by the Spirit unto sons.