JMNT(i)
18 Now God [is] full of faith and reliable (loyal; faithful; trustworthy)! [With] that, our message (or: word) toward you folks is not [other MSS: did not come to be] "Yes," and then [or, at the same time] "No,"
19 for the Son of God, Jesus Christ [= Jesus the Messiah] – the One within the midst of, among and in union with you folks – being heralded and publicly proclaimed through us, [i.e.,] through Silvanus [this may = Silas], Timothy and me – did not come to be (or: was not birthed) "Yes," and yet, "No," but to the contrary, [the divine] "Yes" has been birthed and remains in existence within Him (or: in union with Him, "Yes" has happened and continues being; or: within the midst of Him, [the] "Yes" has come into being and remains)!
20 So you see, as many as [be] God's promises, [they are] the "Yes," within and in union with Him. Wherefore also, through Him [is] The Amen (or: the affirmation; the "Count on it!;" the "It is so") in (or: by; with) God [directed] toward and face to face with glory, a good opinion or reputation, and a manifestation which calls forth praise, through us.
21 Now God [is] the One repeatedly placing us on good, firm footing (constantly stabilizing and establishing us; or: confirming, guaranteeing and validating us as possessed by a purchase) and completely (or: instantly, in one point in time) anointing us, together with you folks, into Christ.
22 He [is] also the One completely (or: instantly, in one point in time) sealing us (imprinting us with [His] mark of identity and ownership; or: validating us and guaranteeing our genuineness), even (or: and) completely (instantly, in one point in time) giving the advance transaction of the agreement (or: the pledge and down payment guaranteeing full payment for purchase; or: a dowry) of the Spirit (or: which is the spirit; or: having its source and origin in the Breath-effect; or: which belongs and pertains to the spirit; from the Attitude) within the midst of our hearts.
23 Now I, myself, continue to call upon God [to be] a witness (or: [as] evidence) upon my own soul (mind, will, emotions; inner life; self; or: = I stake my life on it!), that in my continuing in holding back and sparing you folks, I no longer came (or: I did not yet go) into Corinth.
24 Not that we are constantly acting like your owners and exercising lordship with regard to the faith (or: performing like masters over your loyalty and trust), but to the contrary, we exist being (or: we are) fellow workers regarding and pertaining to your joy, for you folks have taken a stand and now stand firm by trust (or: in and for the faith; with confident loyalty).