St Teresa gives us a famous description of the regularity of a certain soul that has entered the third mansions. One sign of God's activity is how he fills us with a desire not to commit even a venial sin. Another sign of this stage is aridity in prayer.
Our faithfulness and success is doing good work can lead us to be impatient with God's new activity. The careful self regulation of this stage can make us restless in times of dryness in prayer. St Teresa is warning us about the great need for humility. The devil has his tactics in the third mansions. No complaining. God is leading us into the desert to gain many virtues. Humility is the virtue at the foundation of a great spiritual edifice.