Abstract nouns are uncountable. The price of freedom is constant vigilance. Her writing shows maturity and intelligence . The price of oil has stabilized recently. While uncountable nouns do not generally take a plural form, sometimes they may be pluralized when used in a countable sense.
Life is precious.
He likes to eat pizza . Religion has been a powerful force in history. She has beautiful skin . Dr. Moulton is an expert in ancient Greek sculpture . We use only recycled paper in our office.