I've always been impressed by the contrast between contemporary strategies for coping with stress and Paul's counsel for how to get inner peace. Modern approaches tell you to take time off, to get a better work-leisure balance, to block negative and guilty thoughts, to exercise and to learn relaxation techniques. Modern books never tell stressed people: "Think about the big questions of life. Where are we from? Where are we going? What is the meaning of life?"Read the rest.
But Paul says, "Whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable . . . think about such things. . . . And the God of peace will be with you" (Phil. 4:8-9). In effect he is saying: "Think! God made the world and we turned from him—but he's come back to save us at infinite cost to himself. And some day he will put everything right and we will live with him forever. If you really understood and believed that, nothing could get you down for long. So think. If you are discouraged, think about and take hold of Christian doctrine until it puts some health and peace into you."
In short, the world tells you to get peace by not thinking too hard; Christianity tells you that you get peace by thinking very hard—learning, grasping, rejoicing, and resting in the truths of the Word of God.
So learn biblical doctrine—for your health.
Books by Tim Keller: