Depression

When you feel perpetually unmotivated, you start questioning your existence in an unhealthy way; everything becomes a pseudo-intellectual question you have no interest in responding to whatsoever. This whole process becomes your very skin and it does not merely affect you; it actually defines you. So, you see yourself as a shadowy figure unworthy of developing interest, unworthy of wondering about the world – profoundly unworthy in every sense and deeply absent in your very presence.

– Ingmar Bergman