An adaptation of the Catechism for Young Children in modern English.
Question: What is sanctification?
Answer: It is God making sinners holy in thought and action.
Question: What is sanctification?
Answer: It is God’s making sinners holy in heart and conduct.
See question 45 for adapting “God’s”. Additionally, we simplify “heart and conduct” to “thought and action”. Regeneration is typically what is closely connected with a “changed heart”, so the simplifying of the word “heart” is not of particular theological importance in this case.