فوجهك كالنار في ضوئها
Your face is like fire in its light.
وقلبي كالنار في حرها
And my heart is like fire in its heat.
Gathering: Both face and heart are compared with fire.
Differentiation: The face corresponds to fire’s brightness, whereas the heart corresponds to its heat or burning intensity.
One shared vehicle of comparison produces two distinct grounds of resemblance. The figure is more than simple repetition: it joins unity of image with differentiation of meaning.