"a becoming humility"(article before uncountable noun) is OK.
used before some uncountable nouns when you want to limit their meaning in some way, such as when describing them more completely or referring to one example of them:
I only have a limited knowledge of Spanish.
He has a great love of music.
There was a fierceness in her voice.
But in esl article usage rules, an article before "thing"(a countable noun) can be omitted:
Rule 37: Use Ø when generalizing about abstract nouns.
ex: Love is beautiful thing.
Is that correct?