The free gift of adoption requires on our part continual conversion and new life. Praying to our Father should develop in us two fundamental dispositions:
First, the desire to become like him: though created in his image, we are restored to his likeness by grace; and we must respond to this grace.
We must remember . . . And know that when we call God "our Father" we ought to behave as sons of God.
You cannot call the God of all kindness your Father if you preserve a cruel and inhuman heart; for in this case you no longer have in you the marks of the heavenly Father's kindness.
We must contemplate the beauty of the Father without ceasing and adorn our own souls accordingly.
Source: Catechism of the Catholic Church (Vatican.va)