How many times have I been in my therapist's office, saying, "I think I'm smarter than this! I've been down this road! I've learned this lesson!" And she's like, "Yeah, and you're learning it a little bit deeper. "
My father taught me that learning is an endless process, and that there is no limit to the amount of knowledge a person can contain. You are never too old to learn something new, or too young to learn too much.