Some people describe someone whose heart is higher than the sky and whose life is thinner than paper. Is this correct?

I know this is right. Literally, it means that the heart is higher than the sky, which describes a person's character and psychology. Life is thinner than paper, but life is short. In fact, the implied meaning is that if you want to have lofty ideals, you must rely on a good birth environment, family education and personal cultivation education, otherwise you will be too arrogant. In case it backfires, this is my personal understanding, I don't know if it is.