You misunderstand what Paul meant thats all. Paul beseeches, begs the gentile believers multiple times on different occasions to abstain from sin and adhere to the doctrine. Was it for nothing, was paul speaking into the air? The holy Spirit doesn't transform us over night we must learn, and we do it through the guidence of the HS from the word. Your definition of Pauls teaching seems narrow and full or error, it disregards commandments from Paul showing them in an obscure light. Paul made things very simple.
1Co 14:8 For if the trumpet give an uncertain sound, who shall prepare himself to the battle?
1Co 14:9 So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air.
1Co 14:10 There are, it may be, so many kinds of voices in the world, and none of them is without signification.
1Co 14:11 Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh shall be a barbarian unto me.
1Co 14:26 How is it then, brethren? when ye come together, every one of you hath a psalm, hath a doctrine, hath a tongue, hath a revelation, hath an interpretation. Let all things be done unto edifying.