This sonnet explores the contrast between physical beauty and the illusion it can create. At first, the speaker is captivated by the beauty of another person, particularly by their eyes. The beauty of this person is described as a "cover pure and white that hid my sin." However, the speaker soon realizes that this beauty is merely an illusion that hides a deeper reality.
The second quatrain describes how the speaker's mind was lost amidst the "clouds of purest grace" that enveloped the other person's beauty. However, the speaker also discovers that this beauty is like a cage that holds them in place, preventing them from seeing the truth beyond the illusion.
The third quatrain speaks to the speaker's struggle to break free from this illusion, which took many years to accomplish. The speaker realizes that they must look past the physical beauty of the person and see beyond the illusion if they want to break free from its hold.
The final couplet speaks to the speaker's liberation from this enchantment, having broken free from the cage of physical beauty that once held them captive. The contrast between physical beauty and the reality beyond the illusion is the central theme of this sonnet. The speaker discovers that true liberation can only be found by seeing beyond the surface-level beauty and embracing the deeper truth that lies beneath.