What is an example of obstract noun sentence?

It seems like you're asking for an example of a sentence using an abstract noun.

Here are a few examples:

* "Happiness" is a fleeting emotion. (Happiness is the abstract noun)

* Her "courage" inspired us all. (Courage is the abstract noun)

* The "truth" will always prevail. (Truth is the abstract noun)

Abstract nouns represent concepts, ideas, qualities, or states of being. They cannot be touched or seen.

Let me know if you'd like to see more examples or have any other questions!