1-е Петра 1:2

foreknowledge--foreordaining love (Pe1 1:20), inseparable from God's foreknowledge, the origin from which, and pattern according to which, election takes place. Act 2:23, and Rom 11:2, prove "foreknowledge" to be foreordination. God's foreknowledge is not the perception of any ground of action out of Himself; still in it liberty is comprehended, and all absolute constraint debarred [ANSELM in STEIGER]. For so the Son of God was "foreknown" (so the Greek for "foreordained," Pe1 1:20) to be the sacrificial Lamb, not against, or without His will, but His will rested in the will of the Father; this includes self-conscious action; nay, even cheerful acquiescense. The Hebrew and Greek "know" include approval and acknowledging as one's own. The Hebrew marks the oneness of loving and choosing, by having one word for both, bachar (Greek, "hairetizo," Septuagint). Peter descends from the eternal "election" of God through the new birth, to the believer's "sanctification," that from this he might again raise them through the consideration of their new birth to a "living hope" of the heavenly "inheritance" [HEIDEGGER]. The divine three are introduced in their respective functions in redemption. through--Greek, "in"; the element in which we are elected. The "election" of God realized and manifested itself "IN" their sanctification. Believers are "sanctified through the offering of Christ once for all" (Heb 10:10). "Thou must believe and know that thou art holy; not, however, through thine own piety, but through the blood of Christ" [LUTHER]. This is the true sanctification of the Spirit, to obey the Gospel, to trust in Christ [BULLINGER]. sanctification--the Spirit's setting apart of the saint as consecrated to God. The execution of God's choice (Gal 1:4). God the Father gives us sal…

The apostle describes the persons to whom he writes, and salutes them (Pe1 1:1, Pe1 1:2), blesses God for their regeneration to a lively hope of eternal salvation (Pe1 1:3-5), in the hope of this salvation he shows they had great cause of rejoicing, though for a little while they were in heaviness and affliction, for the trial of their faith, which would produce joy unspeakable and full of glory (Pe1 1:6-9). This is that salvation which the ancient prophets foretold and the angels desire to look into (Pe1 1:10-12). He exhorts them to sobriety and holiness, which he presses from the consideration of the blood of Jesus, the invaluable price of man's redemption (Pe1 1:13-21), and to brotherly love, from the consideration of their regeneration, and the excellency of their spiritual state (Pe1 1:22-25).

1:2 knew you and chose you: When God knows a person, it means that he chooses that person. He chose to enter into relationship with his people before they knew him (cp. Rom 8:29; 11:2).