When my kids teach me how I could save mother earth or how to think differently to create an invention.
Build organizations that everyone LOVES! One can create profitable ventures but the one which is seen with immense respect is the hardest to build. Achieving that feat will be one of the best accomplishments.
Chase dreams relentlessly but ethically. Fulfilment of a dream is a step in the journey full of dreams. Never forget that happiness is in the journey and punches you get during this will only make you stronger.