What is in your heart?
“But those things which proceed out of the mouth come forth from the heart; and they defile the man” Matthew 15:18.
“Examine me, O LORD, and prove me; try my reins and my heart” Psalms 26:2.
“Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?” II Corinthians 13:5.