Ophelia in Hamlet Act 4, Scene 5.
In this quote Ophelia makes reference to a fable in which a baker’s daughter was turned into an owl for refusing Jesus bread. At this point, Ophelia is on her downward spiral into despair and madness. She is commenting on how we can know what we are at a given point in time but no one knows what we may become in the future.
So take stock of what you are and be honest. No voyage arrives at the desired port if you know not the truth of from where you start. And chart your course towards what you want to be; just realize fate may have other ideas and they may be better!