Fact of life, humans aren't much good at anything, without some light to see by. We have an inner light too which sets our intent, our hopes, our goals. You can talk to someone for a minute and know if their inner light glows or has gone out.
I'm reminded by this card without an inner light we are no more than lumps of clay or sticks of wood just taking up space, couch potatoes on the sofa of life.
"It is a mistake to think you can solve any major problems just with potatoes." ~ Douglas Adams 1952-2001