We are saved and sealed by GOD’s Grace, not by our merits. We are also instructed by the Word of God to know we are born from above at the moment we are born from above. Try it, you’ll like it!
The teaching of the Catholic church is that all salvation comes from Christ the head through the Church which is his body:
Basing itself on Scripture and Tradition, the Council teaches that the Church, a pilgrim now on Earth, is necessary for salvation: the one Christ is the mediator and the way of salvation; he is present to us in his body which is the Church. He himself explicitly asserted the necessity of faith and baptism and thereby affirmed at the same time the necessity of the Church which men enter through baptism as through a door. Hence they could not be saved who, knowing that the Catholic Church was founded as necessary by God through Christ, would refuse either to enter it or to remain in it.
“Although in ways known to himself God can lead those who, through no fault of their own, are ignorant of the gospel, to that faith without which it is impossible to please him, the Church still has the obligation and also the sacred right to evangelize all men” (CCC 846-48, footnotes omitted).
We show and act on our Faith by our Love of God and love of neighbor.
“We are saved and sealed by GOD’s Grace, not by our merits.”
Seems like I’ve heard that somewhere before...
“For by grace you have been 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. For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.”—Ephesians 2
But just to drive the point home...
“So too at the present time there is a remnant, chosen by grace. But if it is by grace, it is no longer on the basis of works; otherwise grace would no longer be grace.”—Romans 11