You assume that it is within man's power to believe. Col 2:14 is part of that same Gospel
I believe it is by the power that is present in the preaching of the Gospel; the power of the Holy Spirit, the Spirit of Grace that empowers or enables us to believe and obey the Gospel.
That is what grace is; the Spirit of grace, the Holy Spirit working upon each person who is hearing the Gospel being preached by someone sent by God.
By grace we are saved, through faith.
The combination of the Holy Spirit, and the person who hears the Gospel, by which they are enabled or empowered to obey the word of faith.
For I am not ashamed of the gospel of Christ, for it is the power of God to salvation for everyone who believes, for the Jew first and also for the Greek. Romans 1:16
- you have purified your souls in obeying the truth through the Spirit
Since you have purified your souls in obeying the truth through the Spirit in sincere love of the brethren, love one another fervently with a pure heart, having been born again, not of corruptible seed but incorruptible, through the word of God which lives and abides forever,
1 Peter 1:22-23
JLB