The biblical injunction to number our days so that we use time responsibly is not identical with the kind of planning of time that we engage in. That planning, especially if “life planning” is involved, generally assumes two things over which we have no control: that our life is going to continue for a considerable time and that we have some control over the course it will take. Experience should teach us the error in assuming these. People’s lives are often cut short, and few people can predict accurately what they will be doing five or ten years ahead, and the Bible warns us against operating this way. In fact, becoming too busy or anxious is a way of ignoring the temporary nature of this life. This is not to say that all planning is wrong, but we should be more tentative about it and regard it as conditional, as did Paul in making his medium- and long-term plans (1 Cor. 16:5-9). While he had desires and preferences, there is a modesty and flexibility to his approach. We should also be aware that the Bible’s emphasis on recognizing the finite time at our disposal sits uneasily with our general tendency to ignore the passing of time, to work to keep ourselves youthful or to artificially extend the length of our lives. Instead we should preserve a sharp sense of our mortality and recognize that at any point God could remove us from the scene.