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Titus 1:15
To the pure all things are pure, but to those who are defiled and unbelieving nothing is pure; but even their mind and conscience are defiled.
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Romans 2:14-15
for when Gentiles, who do not have the law, by nature do the things in the law, these, although not having the law, are a law to themselves, who show the work of the law written in their hearts, their conscience also bearing witness, and between themselves their thoughts accusing or else excusing them)
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Proverbs 4:23
Keep your heart with all diligence,
For out of it spring the issues of life.
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Proverbs 16:25
There is a way that seems right to a man,
But its end is the way of death.
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Romans 1:28
And even as they did not like to retain God in their knowledge, God gave them over to a debased mind, to do those things which are not fitting;