New American Standard Bible (NASB)
1 Corinthians 2
12 Now we have received, not the spirit of the world, but the Spirit who is from God, so that we may know the things freely given to us by God,
13 which things we also speak, not in words taught by human wisdom, but in those taught by the Spirit, combining spiritual thoughts with spiritual words.
14 But a 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 appraised.
15 But he who is spiritual appraises all things, yet he himself is appraised by no one.
16 For who has known the mind of the Lord, that he will instruct Him? But we have the mind of Christ.
1 Corinthians 3
1 And I, brethren, could not speak to you as to spiritual men, but as to men of flesh, as to infants in Christ.
2 I gave you milk to drink, not solid food; for you were not yet able to receive it. Indeed, even now you are not yet able,
3 for you are still fleshly. For since there is jealousy and strife among you, are you not fleshly, and are you not walking like mere men?
4 For when one says, "I am of Paul," and another, "I am of Apollos," are you not mere men?
5 What then is Apollos? And what is Paul? Servants through whom you believed, even as the Lord gave opportunity to each one.
6 I planted, Apollos watered, but God was causing the growth.