“For by grace you are saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast.”
You and I are saved as a result of a gift. Saul is confronted along the road to Damascus by Jesus — this is the Lord’s gift to Saul, who has literally done nothing to deserve God’s positive attention. Jesus blinds Saul not as a result of any action by the man, but as a gift to him. Saul says “no one may boast” when given such a gift. This gift of grace is “not a result of works.”
Of course, this is not to say that grace will not result in works; it does. But to claim the gift is contingent on those works is a denial of God’s work.