One threat to our security comes from feelings of depression and doubt. The person of faith is described in this psalm as “a rock-solid mountain . . . nothing can move it.” But I am moved. I am full of faith one day and empty with doubt the next. I wake up one morning full of vitality, rejoicing in the sun; the next day I am gray and dismal, faltering and moody. “Nothing can move it”?—nothing could be less true of me. I can be moved by nearly anything: sadness, joy, success, failure. I’m a thermometer and go up and down with the weather.