Romans 3:11
There is not one who is really wise, nor one who is a diligent seeker after God.
Matthew 13:13-14
I speak to them in figurative language for this reason, that while looking they do not see, and while hearing they neither hear nor understand.
Matthew 13:19
When a man hears the Message concerning the Kingdom and does not understand it, the Evil one comes and catches away what has been sown in his heart. This is he who has received the seed by the road-side.
Romans 1:22
While boasting of their wisdom they became utter fools,
Romans 1:28
And just as they had refused to continue to have a full knowledge of God, so it was to utterly worthless minds that God gave them up, for them to do things which should not be done.
Romans 8:7
Abandonment to earthly things is a state of enmity to God. Such a mind does not submit to God's Law, and indeed cannot do so.
Titus 3:3
For there was a time when we also were deficient in understanding, obstinate, deluded, the slaves of various cravings and pleasures, spending our lives in malice and envy, hateful ourselves and hating one another.
1 John 5:20
And we know that the Son of God has come, and has given us understanding so that we know the true One, and are in union with the true One--that is, we are in union with His Son Jesus Christ. He is the true God and the Life of the Ages.