What does the poet mean by "all that's best of dark and bright"?
Answer Details
In Lord Byron's She Walks in Beauty, the phrase "all that's best of dark and bright" describes the woman's beauty as a seamless blending of contrasting qualities. Byron does not present dark and bright as opposites in conflict; instead, they coexist in perfect harmony within her appearance. Her dark hair against her luminous complexion, her shadowed eyes against her radiant expression - these elements combine without one overpowering the other.
This is not a statement about moral duality (good versus evil), nor does it suggest indecisiveness or confusion. The poet is celebrating the way her beauty draws from both ends of the spectrum and fuses them into something greater than either alone. The entire poem develops this idea: she is compared to a cloudless, starry night where darkness and light meet in equal measure.
The answer is that she reflects a perfect balance of opposites, because Byron's central conceit is precisely that her beauty lies in the equilibrium between dark and bright, shadow and radiance, each contributing equally to a unified, harmonious whole.