On Knowing the Elect — John Calvin

“It may be asked, how could this be found out, for the election of God is hid, and cannot be known without the special revelation of the Spirit; and as every one is made sure of his own election by the testimony of the Spirit, so he can know nothing certain of others. To this I answer, that we are not curiously to inquire about the election of our brethren, but ought on the contrary to regard their calling, so that all who are admitted by faith into the church, are to be counted as the elect; for God thus separates them from the world, which is a sign of election.” 

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John Calvin and John Owen, Commentaries on the Catholic Epistles