God gives us a relish for the very things that go to fulfil the demands of our Christian nature. Prayer, meditation, reading the Bible, trust, and resting in the Lord promote increase in him.
What is it in the nature of the oak that causes it to send its root down into the soil and to drink up of its substance? What is it in the nature of the child that causes it so eagerly to eat and play? It is the demand in their nature for growth, or that innate struggle to conform to type.