By our fruits are we known.
But our fruits have nothing to do with our salvation. Only God saves. He wrote the names of the elect in the Book of Life from before the foundation of the world. And none whom the Father has given the Son can be lost. All Scripture, Old and New Testaments, can be summed up in these short verses:
"Jesus answered them, I told you, and ye believed not: the works that I do in my Father's name, they bear witness of me.
But ye believe not, because ye are not of my sheep, as I said unto you.
My sheep hear my voice, and I know them, and they follow me:
And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.
My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand.
I and my Father are one." -- John 10: 25-30.
Christ came to gather the sheep. Thank you, God, that you and I are among them, through nothing in ourselves, but only through the redeeming sacrifice of Jesus Christ.
"Know ye that the LORD he is God: it is he that hath made us, and not we ourselves; we are his people, and the sheep of his pasture." -- Psalms 100:3
The sheep have always belonged to the Good Shepherd. And He loses not one of them.