A man/woman of substance
Definition 1 of 2
Pro Tip 1/3Context Matters
The phrase is often used in business or social contexts to describe significant individuals. 
At the fundraiser, the room was full of men and women of substance.
Pro Tip 2/3Not Just Wealth
It implies respect for their capabilities or achievements, not just their financial status. 
Despite her wealth, she is considered a woman of substance for her philanthropy.
Pro Tip 3/3Powerful Connotation
The phrase conveys a strong positive feeling and is used to express admiration. 
The visiting diplomat was truly a man of substance.