جَاءَ رَجُلٌ
A man came.
Rajulun is indefinite: the event is asserted without identifying a particular man. جَاءَ الرَّجُلُ
The man came.
The definite article can refer to a known or previously established person. But indefiniteness does not invariably mean contempt, nor definiteness honor. Rhetorical meanings such as elevation, belittlement, fewness, and abundance depend on contextual evidence.