1 Corinthians 2:11
For, among human beings, who knows a man's inner thoughts except the man's own spirit within him? In the same way, also, only God's Spirit is acquainted with God's inner thoughts.
Romans 2:15
since they exhibit proof that a knowledge of the conduct which the Law requires is engraven on their hearts, while their consciences also bear witness to the Law, and their thoughts, as if in mutual discussion, accuse them or perhaps maintain their innocence--
2 Corinthians 4:2-6
Nay, we have renounced the secrecy which marks a feeling of shame. We practice no cunning tricks, nor do we adulterate God's Message. But by a full clear statement of the truth we strive to commend ourselves in the presence of God to every human conscience.
Hebrews 4:12-13
For God's Message is full of life and power, and is keener than the sharpest two-edged sword. It pierces even to the severance of soul from spirit, and penetrates between the joints and the marrow, and it can discern the secret thoughts and purposes of the heart.
1 John 3:19-21
And in this way we shall come to know that we are loyal to the truth, and shall satisfy our consciences in His presence