This is an old proverb. It means that it is always better to be healthy than wealthy. A man may be immensely rich. He may have all the luxuries one can dream of. But if he has a grave disease like cancer or something, all his wealth becomes useless. He will not be able to enjoy comforts. He will be slowly crawling inch by inch towards death. Apart from that he has to suffer the mental agony arising from his realization. He will be as good as dead. But if a man is health even if he has no wealth, he can be happy. As he is healthy, he can always work and earn his daily bread. He can lead a happy and contented life with what he has. As he is healthy, there will be no diseases to bother him. He may not be able to spend lavishly or afford luxuries. Therefore it is true to say that health is better than wealth.