Hebrews 5:14

Such persons are mere babes. But solid food is for adults--that is, for those who through constant practice have their spiritual faculties carefully trained to distinguish good from evil.

1 Corinthians 2:6

Yet when we are among mature believers we do speak words of wisdom; a wisdom not belonging, however, to the present age nor to the leaders of the present age who are soon to pass away.

Ephesians 4:13

till we all of us arrive at oneness in faith and in the knowledge of the Son of God, and at mature manhood and the stature of full-grown men in Christ.

Romans 14:1

I now pass to another subject. Receive as a friend a man whose faith is weak, but not for the purpose of deciding mere matters of opinion.

Matthew 5:48

You however are to be complete in goodness, as your Heavenly Father is complete.

Matthew 6:22-23

"The eye is the lamp of the body. If then your eyesight is good, your whole body will be well lighted;

1 Corinthians 2:14-15

The unspiritual man rejects the things of the Spirit of God, and cannot attain to the knowledge of them, because they are spiritually judged.

Ephesians 1:18

the eyes of your understanding being enlightened so that you may know what is the hope which His call to you inspires, what the wealth of the glory of His inheritance in God's people,

Philippians 1:9-10

And it is my prayer that your love may be more and more accompanied by clear knowledge and keen perception, for testing things that differ,

Philippians 3:15

Therefore let all of us who are mature believers cherish these thoughts; and if in any respect you think differently, that also God will make clear to you.

1 Thessalonians 5:21

but test all such, and retain hold of the good.

James 3:2

For we often stumble and fall, all of us. If there is any one who never stumbles in speech, that man has reached maturity of character and is able to curb his whole nature.

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 eye is the lamp of the body. If then your eyesight is good, your whole body will be well lighted;
Ephesians 1:18
the eyes of your understanding being enlightened so that you may know what is the hope which His call to you inspires, what the wealth of the glory of His inheritance in God's people,

To discern

Romans 14:1
I now pass to another subject. Receive as a friend a man whose faith is weak, but not for the purpose of deciding mere matters of opinion.
Philippians 1:9
And it is my prayer that your love may be more and more accompanied by clear knowledge and keen perception, for testing things that differ,