Inner life and outer life
If we give priority to the outer life, our inner life will be dark and scary. We will not know what to do with solitude. We will be deeply uncomfortable with self-examination, and we will have an increasingly short attention span for any kind of reflection. Even more seriously, our lives will lack integrity. Outwardly, we will need to project confidence, spiritual and emotional health and wholeness, while inwardly we may be filled with self-doubts, anxieties, self-pity, and old grudges.
Tim Keller in Prayer