1 Thessalonians 4:9

9As to brotherly love. Having previously, in lofty terms, commended their love, he now speaks by way of anticipation, saying, ye need not that I write to you. He assigns a reason — because they had been divinely taught — by which he means that love was engraven upon their hearts, so that there was no need of letters written on paper. For he does not mean simply what John says in his first Canonical (571) Epistle, the anointing will teach you, (1 John 2:27) but that their hearts were framed for love; so that it appears that the Holy Spirit inwardly dictates efficaciously what is to be done, so that there is no need to give injunctions in writing. He subjoins an argument from the greater to the less; for as their love diffuses itself through the whole of Macedonia, he infers that it is not to be doubted that they love one another. Hence the particle for means likewise, or nay more, for, as I have already stated, he adds it for the sake of greater intensity.