In just three lines of verse, Walt Whitman touches on a critical aspect of what it is to be human: knowing that not only is each one of us a world to ourselves, but that within those worlds lies a bevy of opportunities for surprise.
But when was the last time you actually surprised yourself? After all, it’s easy to get caught up in comforting confirmation biases and pleasant patterns that support what you already know. For this reason, reading self-help books that interest you might not help you learn anything new at all. Alternatively, you could go around and quiz the people in your life about what they’ve observed about you. Unfortunately, this might be less enjoyable for them than it is for you.