6他叫我们能承当这新约的执事。不是凭着字句，乃是凭着精意。因为那字句是叫人死，精意是叫人活。（精意或作圣灵）。
NIV He has made us competent as ministers of a new covenant--not of the letter but of the Spirit; for the letter kills, but the Spirit gives life.

但是，主的灵，就是指基督第二位格。没有争议！

至于3：6中的那灵，如果根据3：17，我更倾向于指基督，而不是圣灵，何况这里说的是新约的职事！

当然，这里泛指神的灵也是完全可以的（小写的灵），即指代圣灵或基督。

17主就是那灵。主的灵在哪里，哪里就得以自由。
NIV:Now the Lord is the Spirit, and where the Spirit of the Lord is, there is freedom.

KJV: Now the Lord is that Spirit: and where the Spirit of the Lord [is], there [is] liberty.

18我们众人既然敞着脸，得以看见主的荣光，好像从镜子里返照，就变成主的形状，荣上加荣，如同从主的灵变成的。
And we, who with unveiled faces all reflect the Lord's glory, are being transformed into his likeness with ever-increasing glory, which comes from the Lord, who is the Spirit.