Your attitude determines how high you can rise, not your altitude. Only 10% of an iceberg is visible above the sea level, with 90% of it below sea level, similar to how only a small part of one's attitude is visible to others. One's attitude is driven by underlying values, judgments, motives and beliefs, just as the largest part of an iceberg is invisible below the surface. According to the document, attitude is the most important factor that makes your life 100%, more so than knowledge, hard work or skills.