Do Inspirational Quotes Fall Under Copyright Protection?

(And I thought writing some hobbyist blog were mindless fun...)

If I look at quotes, phrases, and passages from copyrighted books, do I have to add any disclaimer or ask for permission of the author?
This one, for example:

"The twin killers of success are impatience and greed." -- Jim Rohn

Do such inspirational quotes really help people? It's so abstract that everybody can agree. Why not just stick to the Bible?