…But as God is true, our word toward you was not yea and nay.  For the Son of God, Jesus Christ, who was preached among you by us, by me and Silvanus and Timotheus, was not yea and nay, but in him was yea.  For all the promises of God in Him are yea, and in Him Amen, unto the glory of God by us.
Now He which stablisheth us with you in Christ, and hath anointed us, is God; who hath also sealed us, and given the earnest of the Spirit in our hearts…
2 Corinthians 1:18-22