Sometimes we think we know ourselves, but we don't including me. You definitely know lot's of things about yourself, but there are so many more important things you could learn about yourself. The main thing most people don't know about themselves is how they feel on a deeper level. Brains are very good at knowing when you are upset or happy, but they are bad at knowing what's making you feel that way. A big part of philosophy is asking questions. Since we are talking about feelings this can look like Why am i upset? What made me this way? Who has me upset?. We can work on knowing how we feel by starting to ask questions, and better explaining what we are going through. Journaling can definitely help with understand emotions.