he had lectured to the effect that a rich man is a person who has abundant thoughts

nope it's extremely clearly in context talking about a person rich in actual stuff and the message is that having tonnes of stuff while others have nothing is bad

personally I think being rich is incompatible with Christianity because wealth messes with your head and makes it harder to empathise with people and also the fact that rich people have money and resources that really would be better used making sure everyone has a roof and enough to eat etc