John 4:23-24
But the time will come, and is now [actually] here, when the true worshipers will worship the Father in spirit [i.e., from the heart] and truth [i.e., according to God's revealed will], for these are the people whom the Father seeks to be His worshipers.
Romans 7:22
For in my heart I am delighted with God's law,
James 4:8
Come close to God and He will come close to you. Wash your hands, you sinful people [i.e., this is an exhortation to repent of moral and spiritual corruption], and purify your hearts, you double-minded people.
1 Peter 3:4
But [the kind of adornment you should display is] that of the inner person, with its enduring qualities of a meek and calm spirit, which are extremely valuable in God's eyes.
Luke 11:39
And the Lord said to him, "Now you Pharisees [meticulously] clean the outside of the cup and the dish [i.e., this was an allusion to their lives], but you are filled with greed for wealth and [other] evils on the inside.
2 Corinthians 1:12
For this is what we boast of: Our conscience testifies that we have conducted ourselves in the world, and especially toward you, in holiness and godly sincerity, not with human wisdom, but with the favor of God.