Monergism

God elected believers; but He chose them that they might be so, not because they were already so...Neither are we called because we believed, but that we may believe; and by that calling which is without repentance it is effected and carried through that we should believe.
Augustine from Treatise On The Predestination of the Saints (Ch. 38)

Those of mankind that are predestinated unto life, God, before the foundation of the world was laid, according to his eternal and immutable purpose, and the secret counsel and good pleasure of his will, hath chosen in Christ, unto everlasting glory, out of his mere free grace and love, without any foresight of faith or good works, or perseverance in either of them, or any other thing in the creature, as conditions, or causes moving him thereunto; and all to the praise of his glorious grace.
Westminster Confession of Faith (3.5)

...the conversion of a sinner being not owing to a man's self determination, but to God's determination, and eternal election, which is absolute, and depending on the sovereign Will of God, and not on the free will of man; as is evident from what has been said: and it being very evident from the Scriptures, that the eternal election of saints to the faith and holiness, is also an election of them to eternal salvation; hence their appointment to salvation must also be absolute, and not depending on their contingent, self-determining Will.
Jonathan Edwards