Two phrases which build up the theme of contrast and balance in beauty are:
"And all that’s best of dark and bright
Meet in her aspect and her eyes."
Step-by-step explanation:
These lines have been taken from one of the most famous poems written by Lord Byron. The name of this poem is "She Walks in Beauty". The theme of this poem is contrast and the balance in beauty.
These lines seek to show that beauty is not always lights. In order for something to be beautiful, it has to have both positive and negative aspects. Nothing is fully good or fully bad, it has to posses a balance, an equilibrium in which all the parts come together to create a truly beautiful thing.