'Thereof' in the Bible

When goods increase, they are increased that eat them; and what profit is there to the owner thereof, except the beholding of them with his eyes?

There is a grievous evil that I have seen under the sun: riches kept for the owners thereof to their hurt;

Every man also to whom God hath given riches and wealth, and power to eat thereof, and to take his portion and to rejoice in his labour: that is a gift of God.

one to whom God giveth riches, wealth, and honour, and he wanteth nothing for his soul of all that he desireth, yet God giveth him not power to eat thereof, but a stranger eateth it: this is vanity, and a sore evil.