There is an old saying "well begun is half done"-'tis a bad one. I would use instead-Not begun at all 'til half done.
John KeatsI am certain of nothing but the holiness of the Heartโs affections and the truth of the Imagination โ What the imagination seizes as Beauty must be truth โ whether it existed before or not โ for I have the same Idea of all our Passions as of Love they are all in their sublime, creative of essential Beauty . . .
John Keats