Witness Lee said this quote
“ The Corinthians talked about spiritual things, but they did so in a fleshy and soulish way. The apostle Paul told them in the first book that they were fleshy and not spiritual (3:1), and in chapter 2 of the first book, he spoke of soulish men (v. 14). A spiritual man (v. 15) is one who does not behave according to the flesh or act according to the soulish life but lives according to the spirit, that is, his spirit (Rom. 1:9) mingled with the Spirit of God (8:16; 1 Cor. 6:17). Such a one is dominated, governed, directed, moved, and led by such a mingled spirit. Although the Corinthians spoke much about spiritual things, the apostle Paul designated them as fleshy and soulish. They were talking about spiritual things in the soul and in the flesh. Some may talk about the heavenly things in Ephesians, but they do so as Corinthians—in the soul or in the flesh. ”