2 Corinthians 1:19
19 1For the Son of God, Jesus Christ, who was preached among you through us, through me and 2Silvanus and Timothy, did not become yes and no, but our word has become ayes in Him.
191 For introduces the reason for what is mentioned in the preceding verse. God is faithful, never changing, especially in His promises concerning Christ. Hence, the word the apostles preached concerning Christ was likewise never changing, because the very Christ whom God promised in His faithful word and whom they preached in their gospel did not become yes and no. Rather, in Him is yes. Since the Christ whom they preached according to God's promises did not become yes and no, the word they preached concerning Him was not yes and no. Not only their preaching but also their living was according to what Christ is. They preached Christ and lived Him. They were not men of yes and no but men who were the same as Christ.