Step 1: Understanding the Concept:
This question pertains to the distinction made between 'civilization' and 'culture' in Humayun Kabir's essay, 'The Unity of Indian Culture'.
Step 2: Detailed Explanation:
According to the author, 'civilization' refers to the material and organizational aspects of a society (e.g., tools, laws, infrastructure). Many people can be part of a civilization.
'Culture', however, is described as the "efflorescence" (or flowering) of civilization. It relates to the intellectual, artistic, and spiritual achievements of a society.
The author argues that achieving culture requires a level of refinement and understanding that only a small minority of any civilized population truly attains.
Step 3: Final Answer:
The sentence implies that while a civilization can be large, the culturally refined section within it is typically small.