2:2 sincere. That is, “pure.”
2:2 of the word. “Of the word” here is one word, logikos in the Greek, translated “reasonable” in its only other occurrence (Romans 12:1). As babes need milk for food to begin physical growth, so babes in Christ need “pure, reasonable [or logical] spiritual milk” if they are to grow spiritually, and this is only to be obtained from God’s Word. They were “born again” through the Word (I Peter 1:23), and now must grow through the Word. As they grow, however, they must soon begin also to partake of the “strong meat” of the “word of righteousness” (Hebrews 5:12-14).
2:3 If so be. This little phrase (Greek ei per) occurs four times in Scripture, seemingly expressing certain conditions, but actually leading to great assurances. See also Romans 8:9, 17; and I Corinthians 15:15.
2:4 living stone. As not just the foundation rock (I Corinthians 3:11), but also as a living stone that could bring life and sustenance, Christ is the fulfillment of the type suggested by the rock smitten in the wilderness, which thenceforth brought life-sustaining water to God’s people (see Exodus 17:6; Numbers 20:8; I Corinthians 10:4).
2:4 chosen of God. The Greek word here for “chosen” (also in I Peter 2:9) is the same as that for “elect” in I Peter 1:2 and 2:6. Thus, the “elect of God” are those “chosen by God.” Note also John 15:16 and Ephesians 1:4.