'Reason' in the Bible

This is our [reason for] proud confidence: our conscience testifies that we have conducted ourselves in the world [in general], and especially toward you, with pure motives and godly sincerity, not in human wisdom, but in the grace of God [that is, His gracious lovingkindness that leads people to Christ and spiritual maturity].

For as many as are the promises of God, in Christ they are [all answered] “Yes.” So through Him we say our “Amen” to the glory of God.