Tim Maas Supporter Retired Quality Assurance Specialist with the U.S. Army

In my opinion, Peter is speaking of the most elemental truths of the gospel, which I would summarize as the existence of one holy eternal God in three Persons; universal human sinfulness, resulting in the inability of humans to make themselves acceptable to God through their own actions, and consigning them to eternal separation from God; the incarnation of Christ as both true God and true man; Christ's death as the sufficient payment of God's penalty for human sin; and Christ's resurrection as the proof that that payment was sufficient in God's sight, making human salvation possible by faith in that payment, rather than in individual effort.

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Jack Gutknecht Supporter ABC/DTS graduate, guitar music ministry Baptist church

"Pure spiritual milk" is a metaphor for the Word of God. 
It is how we grow in our salvation, becoming all that God has called us to be. So we have to crave the Word of God. It is pure, uncontaminated.

I think it means "the source of Christian growth (see First Peter 1:24-25)."

--24 for
"All flesh is like grass
and all its glory like the flower of grass.
The grass withers,
and the flower falls,
25 but the word of the Lord remains forever."
And this word is the good news that was preached to you.
--Faithlife Study Bible 

I agree, that "'milk'" refers to the "Elementary Christian teaching [which is] likened to milk. Hebrews 5:12-13 See also 1 Corinthians 3:2;
1 Peter 2:2." 
--https://biblehub.com/topical/1_peter/2-2.htm click on 4480 milk

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