Cannot
This is the state of mind a Darksider must get out of. It is the collective of skeptical ideas and beliefs that have been embedded into your mind. It is the constant thoughts of "I cannot (feel the force, overcome fear, make weapons of my imperfections, find uses for my emotions, etc.)." These thoughts are the beginning but one of the most important parts of a Darksider's training. When you doubt yourself, reality will rip you to shreds. Every time you say you cannot, you curse yourself and sell yourself short. This state becomes a wall to the Darksider, which they must breakdown themselves. It is your own, only the individual can control this. This is where limitations will be destroyed. This is also where the Shadow of your mind is hidden.