The Flesh And The Spirit

Vos autem in carne non estis, sed in spiritu; si tamen spiritus Dei habitat in vobis. Si secundum interiorem hominem condelectamini legi Dei. Hoc enim est, si spiritus Dei habitat in vobis. Nam si de vestro spiritu praesumitis, adhuc in carne estis. Sic enim non estis in carne, si in spiritu Dei sitis. Nam si recedit spiritus Dei, pondere suo spiritus hominis revolvitur in carnem; redit ad facta carnalia, redit ad concupiscentias carnales, et fiunt hominis illius novissima pejora prioribus. Sic ego habete liberum arbitrium, ut imploretis auxilium. Non estis in carne. Et hoc ex viribus vestris? Absit! Unde ergo? Si tamen spiritus Dei habitat in vobis. Si quis autem spiritum Christi non habet, hic non est ejus. Non ergo se jactet, non se extendat, non sibi arroget virtutem propriam egena et vitiata natura, quia si quis spiritum Christi non habet, hic non est ejus. Ipse est spiritus Dei, qui spiritus Christi; ipse Patris, qui Filii. Sed ecce adjuvante ipsius misericordia spiritum Christi habemus, et ipsa delectatione justitiae, et integra fide et catholica, spiritum Dei nobis inesse cognoscimus. Guillelmus S Theodorici Abbas, Expositio In Epistolam Ad Romanos, Liber V Source: Migne PG 180.629b-c

For you are not in the flesh, but in the spirit, if indeed the spirit of God dwells in you. 1 If according to the interior man you delight in the law of God. That is, if the spirit of God dwells in you. For if you presume concerning your spirit, you are yet in the flesh. You are not in the flesh if you are in the spirit of God. For if the spirit of God is withdrawn, by the weight of your spirit of man you tumble back into the flesh, you return to carnal deeds, you return to carnal desires, and what the last man does is worse than the first. 2 So I have a free will that I might implore aid. 'You are not in the flesh.' And is this from your own power? Let is not be! From where, then? 'If indeed you have the spirit of God dwelling in you.' For if someone does not have the spirit of Christ, he is not Christ's. Let him therefore not boast of himself, nor enlarge himself, nor arrogate to himself his own virtue in the poverty and ruin of his nature, because if someone does not have the spirit of Christ, he is not His. The spirit of God is the spirit of Christ, He is of the Father who is of the Son. But, behold, with the aid of His mercy we have the spirit of Christ, and by the love of righteousness and by a secure and catholic faith we know the spirit of God is in us. William of St Thierry, Commentary on Romans, Book 5 1 Rom 8.9 2 Mt 12.45, Lk 11.26