Know thyself is a phrase that encourages self-awareness and introspection. It is often associated with the ancient Greek philosopher Socrates, who believed that true wisdom comes from knowing oneself. Intrapersonal intelligence is the ability to understand and manage one's own emotions, thoughts, and behaviors. It involves being self-aware, reflective, and empathetic. People with high intrapersonal intelligence are often good at self-regulation and problem-solving.