Some adolescents pass through a stage when they want to know who they are and what is the meaning of life. Then they grow up and die.
It is better to stay an adolescent in our thinking.
When we change enough we may realise that we don't know who we are, or that we are not who we thought we were. If we are what is common to what was before and what is now then what we thought we were shrinks indefinitely. It can only stay the same if we have fossilised.
Yet what watches remains.