Final answer:
The line "Sometime too hot the eye of heaven shines," from Shakespeare's Sonnet 18, refers to the excessive heat of the sun causing discomfort.
Step-by-step explanation:
In Shakespeare's Sonnet 18, the line "Sometime too hot the eye of heaven shines," refers to the excessive heat of the sun causing discomfort. This line depicts the sun as the "eye of heaven" which at times shines too intensely, suggesting the sun's powerful and overwhelming heat. It is a part of Shakespeare's extended metaphor comparing a person to a summer's day, expressing that while a summer's day can have its extreme moments (like the intense heat of the sun), the person being addressed in the poem surpasses the day in beauty and consistency.