Turretin: Election not based on foreseen faith

XXII. Third, if election is from foreseen faith, God must have foreseen it in us: either as an act of nature proceeding from us, or as an act of grace depending on God, or as a common act, arising conjointly from both (partly from God, partly from man). If as an act of God, he foresaw is therefore as his own gift (i.e. decreed by him from election) Thus it would follow, not precede election. IT as an act of nature we therefore elected ourselves (contrary to Paul, 1 Cor. 4:7), Pelagius gains the victory. If as a common act, either the act of God takes its form from the act of man (and so man would be the architect of his own salvation and could sacrifice to his own net, since he would bring to his own salvation the principal part) or the act of man takes its form from the act of God (and so election will be the case of faith, not the contrary). We must either ascend with the Scriptures to God discriminating among men by his own gift, or descend with Pelagius to man discriminating himself by his own free will (for there can be no middle way). [Francis Turretin, Institutes of Elenctic Theology, 1.4.XI.22]