Thats the elect all, Paul had called them the called and chosen in
1 Cor 1:26-29
It's always amazing how adroitly some Protestants insert their theology into the scriptures, and they proclaim that they form their theology from the bible alone, or at least from the scriptures as the sole infallible authority for the forming of doctrine. Let's take a look at the paragraph that contains the passage you cited.
For the word of the cross, to them indeed that perish, is foolishness: but to them that are saved, that is, to us, it is the power of God. For it is written: I will destroy the wisdom of the wise: and the prudence of the prudent I will reject. Where is the wise? Where is the scribe? Where is the disputer of this world? Hath not God made foolish the wisdom of this world? For, seeing that in the wisdom of God, the world, by wisdom, knew not God, it pleased God, by the foolishness of our preaching, to save them that believe. For both the Jews require signs: and the Greeks seek after wisdom. But we preach Christ crucified: unto the Jews indeed a stumblingblock, and unto the Gentiles foolishness: But unto them that are called, both Jews and Greeks, Christ, the power of God and the wisdom of God. For the foolishness of God is wiser than men: and the weakness of God is stronger than men. For see your vocation, brethren, that there are not many wise according to the flesh, not many mighty, not many noble. But the foolish things of the world hath God chosen, that he may confound the wise: and the weak things of the world hath God chosen, that he may confound the strong. And the base things of the world and the things that are contemptible, hath God chosen: and things that are not, that he might bring to nought things that are: That no flesh should glory in his sight. But of him are you in Christ Jesus, who of God is made unto us wisdom and justice and sanctification and redemption: That, as it is written: He that glorieth may glory in the Lord.
(1 Corinthians 1:18-31 DRB)
The members of the Church of the living God, which is the pillar and foundation of truth as stated in 1 Timothy 3:15, are summoned by the gospel. They are selected through faith in Jesus Christ, all by the grace of God—an unmerited gift bestowed through Jesus Christ. Scripture indicates that the purpose of this calling and selection is to confound the wise, powerful, and prominent of this world with the gospel's appeal to the humble, weak, and seemingly insignificant, choosing them to nullify what is considered significant in worldly terms. The Lord sought out sinners for repentance, not the righteous, associating with prostitutes and tax collectors rather than the leading religious figures and the affluent of His era. Thus, the election is by grace, not by worldly merit. This is the essence of Saint Paul's message.
Nevertheless saint Paul desires therefore, first of all, that supplications, prayers, intercessions and thanksgivings be made for all men: For kings and for all that are in high station: that we may lead a quiet and a peaceable life in all piety and chastity. For this is good and acceptable in the sight of God our Saviour, Who will have all men to be saved and to come to the knowledge of the truth. For there is one God: and one mediator of God and men, the man Christ Jesus: Who gave himself a redemption for all, a testimony in due times. (1 Timothy 2:1-6 DRB)
And so, we know that Christ died for all, God's just man died for the unjust and that is what election is about, God's purpose to give his only begotten Son: that whosoever believeth in him may not perish but may have life everlasting.
