The Predestination of the Saints/Gift of Perseverance

Who can hear the apostle saying, “Blessed be the God and Father of our Lord Jesus Christ, who has blessed us in all spiritual blessing in the heavens in Christ; as He has chosen us in Him before the foundation of the world, that we should be holy and without spot in His sight; in love predestinating us to the adoption of children by Jesus Christ to Himself according to the good pleasure of His will, wherein He has shown us favour in His beloved Son; in whom we have redemption through His blood, the remission of sins according to the riches of His grace, which has abounded to us in all wisdom and prudence; that He might show to us the mystery of His will according to His good pleasure, which He has purposed in Himself, in the dispensation of the fullness of times, to restore all things in Christ, which are in heaven, and in the earth, in Him: in whom also we have obtained a share, being predestinated according to the purpose; who works all things according to the counsel of His will, that we should be to the praise of his glory;” — who, I say, can hear these words with attention and intelligence, and can venture to have any doubt concerning a truth so clear as this which we are defending? God chose Christ's members in Him before the foundation of the world; and how should He choose those who as yet did not exist, except by predestinating them? Therefore He chose us by predestinating us. Would he choose the unholy and the unclean? Now if the question be proposed, whether He would choose such, or rather the holy and unstained, who can ask which of these he may answer, and not give his opinion at once in favour of the holy and pure?