Hebrews 5:14

But solid food is for the mature, for those who have their sense trained by practice to distinguish good from evil.

1 Corinthians 2:6

Yet we do speak a wisdom among the mature, a wisdom, however, not of this age nor of the rulers of this age, who are passing away.

Ephesians 4:13

until we all attain to the unity of the faith and of the knowledge of the Son of God, to become mature, to the measure of the stature of the fullness of Christ.

Romans 14:1

As for the man who is weak in faith, accept him, but not for disputes over opinions.

Matthew 5:48

You, therefore, must be perfect, as your heavenly Father is perfect.

Matthew 6:22-23

The lamp of the body is the eye. So if your eye is good, your whole body will be full of light.

1 Corinthians 2:14-15

But the natural man does not accept the things of the Spirit of God, for they are foolishness to him; and he cannot understand them, because they are spiritually discerned.

Ephesians 1:18

I pray also that the eyes of your heart may be enlightened, so that you may know what is the hope to which he has called you, what are the riches of his glorious inheritance in the saints,

Philippians 1:9-10

And this is my prayer, that your love may abound still more and more in real knowledge and all discernment,

Philippians 3:15

Let those of us who are mature have this attitude; and if in anything you have a different attitude, God will reveal that also to you.

1 Thessalonians 5:21

But test everything; hold fast to what is good.

James 3:2

For we all stumble in many ways. If anyone does not stumble in what he says, he is a perfect man, able to bridle the whole body as well.

Treasury of Scripture Knowledge

Summary

But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.

Bible References

Their

Matthew 6:22
The lamp of the body is the eye. So if your eye is good, your whole body will be full of light.
Ephesians 1:18
I pray also that the eyes of your heart may be enlightened, so that you may know what is the hope to which he has called you, what are the riches of his glorious inheritance in the saints,

To discern

Romans 14:1
As for the man who is weak in faith, accept him, but not for disputes over opinions.
Philippians 1:9
And this is my prayer, that your love may abound still more and more in real knowledge and all discernment,