To pursue mental operations to any depth, a person has to learn to concentrate attention. Without focus, consciousness is in a state of chaos. The normal condition of the mind is one of informational disorder: random thoughts chase one another instead of lining up in logical causal sequences. Unless one learns to concentrate, and is able to invest the effort, thoughts will scatter without reaching any conclusion.
From Finding Flow: The Psychology Of Engagement With Everyday Life by Mihaly Csikszentmihalyi