Witness of the Holy Spirit

5 Who is the one who overcomes the world, but he who believes that Jesus is the Son of God? 6 This is the One who came by water and blood, Jesus Christ; not with the water only, but with the water and with the blood. It is the Spirit who testifies, because the Spirit is the truth. 7 For there are three that testify: 8 the Spirit and the water and the blood; and the three are in agreement.

~ 1 John 5:5-8 (NASB)

Paul's Change of Plans

Now this is our boast: Our conscience testifies that we have conducted ourselves in the world, and especially in our relations with you, in the holiness and sincerity that are from God. We have done so not according to worldly wisdom but according to God's grace.

~ 2 Corinthians 1:12