Two contradicting thoughts I have had:
1. Live each day as it comes. Be ever-changing, ever-new. Be what the moment expects you to be. Dont cling on. Keep changing your ideas/thoughts as you get inputs. Grow with time.
2. Be constant. Be an integral entity, not a series of ever-changing adjectives. Set your beliefs, and follow them. Dont change with every tick in the clock. Contradictions and denials are not growth. Stand by the idea that is 'you'.