Believers are a new thing: babes no less.

As newborn babes, desire the sincere milk of the word, that ye may grow thereby: 1 Peter 2:2

1 Peter 2:9ff expands this new infancy of ours from nursing infants to mature servants serving others.

I guess we do not want to be babes for too long: babes are totally and rightly self-centered.

1. chosen generation
2. royal priesthood
3. holy nation
4. peculiar people

Purpose

As to the purpose of this Peter is graphically honest. We ought to have a message to others.

• that ye should shew forth the praises ( aretas αρετάς from arete αρετή ) of him who hath called you out of darkness into his marvellous light:

We message Christ’s excellent things because we have tasted, we have migrated from darkness to light.

Straight-up, no guessing translation

If (SINCE) so be ye have tasted that the Lord is gracious. 1 Peter 2:3

Since you tasted (did taste) ⸀εἰ ἐγεύσασθε ὅτι χρηστὸς ὁ κύριος.

Move on from baby things soon!