In your cases-- He's got a passion for music -- here we use the article because a kind of passion ( for music ) is mentioned; passion is qualified. Honesty is his good quality -- no qualification of honesty , ergo no article Reading brings happiness to my life -- no qualification of happiness , ergo ditto. Let us qualify: ( An ) honesty in financial matters is essential for an accountant.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.