The document discusses how much of an iceberg is visible above the waterline versus how much is below. It notes that only 10% of an iceberg is visible, while 90% remains below the surface, invisible to observers. This is analogous to human beings, where only certain knowledge, skills, behaviors and attitudes are visible to others, while underlying values, motives and beliefs remain unseen. Maintaining a positive attitude is important, as reflected in several quotes provided about focusing on possibilities rather than limitations and changing one's perspective when needed.