Hebrews 5:14

But 'solid food' is for Christians of mature faith--those whose faculties have been trained by practice to distinguish right from wrong.

1 Corinthians 2:6

Yet there is a philosophy that we teach to those whose faith is matured, but it is not the philosophy of to-day, nor that of the leaders of to-day-men whose downfall is at hand.

Ephesians 4:13

And this shall continue, until we all attain to that unity which is given by faith and by a fuller knowledge of the Son of God; until we reach the ideal man--the full standard of the perfection of the Christ.

Romans 14:1

As for those whose faith is weak, always receive them as friends, but not for the purpose of passing judgment on their scruples.

Matthew 5:48

You, then, must become perfect--as your heavenly Father is perfect.

Matthew 6:22-23

The lamp of the body is the eye. If your eye is unclouded, your whole body will be lit up;

1 Corinthians 2:14-15

The merely intellectual man rejects the teaching of the Spirit of God; for to him it is mere folly; he cannot grasp it, because it is to be understood only by spiritual insight.

Ephesians 1:18

That your minds may be so enlightened that you may realize the hope given by God's Call, the wealth of the glory of his heritage among Christ's People,

Philippians 1:9-10

And what I pray for is this--that your love may grow yet stronger and stronger, with increasing knowledge and all discernment,

Philippians 3:15

Let all of us, then, whose faith is mature, think thus. Then, if on any matter you think otherwise, God will make that also plain to you.

1 Thessalonians 5:21

Bring everything to the test; cling to what is good;

James 3:2

We often make mistakes, every one of us. Any one who does not make mistakes when speaking is indeed a perfect man, able to bridle his 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. If your eye is unclouded, your whole body will be lit up;
Ephesians 1:18
That your minds may be so enlightened that you may realize the hope given by God's Call, the wealth of the glory of his heritage among Christ's People,

To discern

Romans 14:1
As for those whose faith is weak, always receive them as friends, but not for the purpose of passing judgment on their scruples.
Philippians 1:9
And what I pray for is this--that your love may grow yet stronger and stronger, with increasing knowledge and all discernment,