Romans 8:8 "so they that are in the flesh can not please God. " Why can't we please God just for been human beings its because God is holy and Spirit and we have to worship Him in Spirit and Holyness. The flesh works against the spirit of God hence why Bible tells us to bring it in to subjection. There will be situation that you will be failed by the flesh but the Spirit of God will never leave you nor forsake you, HIs joy only gives you strength. AMEN P.S. be strong in spirit