The wajh al-shabah is the specific feature intended as common to both terms. It is not the sum of every property the two things might possess.
Guidance is the ground in “Knowledge is like light in guidance,” not weight or color. Softness is the ground in “Paper is like silk in softness,” not their cost or method of manufacture.
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Ilm al-Bayan and Simile: Definition, Elements, Terms and Particles
The wajh al-shabah is the specific feature intended as common to both terms. It is not the sum of every property the two things might possess.
Guidance is the ground in “Knowledge is like light in guidance,” not weight or color. Softness is the ground in “Paper is like silk in softness,” not their cost or method of manufacture.