We are chosen and become the elect of God by the faith of Christ in which our belief comes from as we being the whosoever that believe in Him as our Savior. Just as Christ never spoke anything or did anything other then what God gave Him to speak and the power and authority to do the works of God, John 12:44-50, so is the same with those who believe in Him as being the Son of God who is the word and light of God come to earth in the form of man to seek and save the lost, Luke 19:10. Faith in Christ by His faith in the Father.
John 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
Romans 3:22 Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference:
Galatians 2:16 Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.