Hebrews 5:14

but solid food is for the perfect, having their perceptive faculties exercised by practice to distinguish both good and evil.

1 Corinthians 2:6

But we speak wisdom among the perfect, but not the wisdom of this life, nor of the rulers of this life, who are destroyed;

Ephesians 4:13

till we all come to the unity of the faith and of the knowledge of the Son of God, to a perfect man, to the measure of the stature of the fullness of Christ,

Romans 14:1

RECEIVE the weak in faith, not to doubtful reasonings.

Matthew 5:48

Be therefore perfect, as your heavenly Father is perfect.

Matthew 6:22-23

The light of the body is the eye. If, therefore, your eye is sound, your whole body will be light;

1 Corinthians 2:14-15

But the natural man receives not the [things] of the Spirit of God, for they are foolishness to him, and he cannot know them, for they are spiritually discerned.

Ephesians 1:18

the eyes of your minds being enlightened, that you may know what is the hope of his call, and what the riches of the glory of his inheritance in the saints,

Philippians 1:9-10

And this I pray, that your love may abound yet more and more in knowledge and all understanding,

Philippians 3:15

Let us, as many as are perfect therefore, be of this mind; and if any one thinks at all otherwise, God shall also reveal this to you;

1 Thessalonians 5:21

Prove all things, hold fast the good;

James 3:2

For in many things we all offend; if one offends not in word he is a perfect man, able to keep in subjection also the whole body.

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 light of the body is the eye. If, therefore, your eye is sound, your whole body will be light;
Ephesians 1:18
the eyes of your minds being enlightened, that you may know what is the hope of his call, and what the riches of the glory of his inheritance in the saints,

To discern

Romans 14:1
RECEIVE the weak in faith, not to doubtful reasonings.
Philippians 1:9
And this I pray, that your love may abound yet more and more in knowledge and all understanding,