Abstract nouns refer to ideas, qualities, and concepts that we cannot see or touch, such as happiness, truth, justice, beauty, education, confidence. Whether we use an article depends on whether the idea is general, specific, or part of a fixed expression.
When we talk about an idea in general, we normally use no article.
Here the nouns refer to broad concepts, not specific instances.
We use the when the abstract noun refers to a particular instance or something defined by context.
This pattern is especially common with the + abstract noun + of.
Abstract nouns can take a/an when we talk about a specific example or a type of feeling/quality.
This doesn’t refer to the general idea — just one expression of it.
Some abstract nouns occur in stable expressions that always use the.
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