"any one of you who does not renounce all that he has cannot be my disciple."
"Can anyone explain how that fits because if one just looks at it, it's an obvious contradiction."...Codek
"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."
Salvation is a gift indeed, given freely in the sense that man cannot earn it,and thereby the one with superior works or a stonger personality who performed more aptly, would deserve it. No one deserves , nor can earn Salvation. In this sense it is free.
Salvation in the terms of the Giver, though, was not at all free. It was the most expensive gift ever given; the torture and slaughter of the most holy man, Jesus, who is God Himself. He said; " I lay down my life; I pick it up again."
The crucifiction of the sinless One was His gift, in order for whosever will come, to live forever.
In the same sense, it is a gift to the Receiver; all mankind and persons in particular, like you in me. It is free in the sense that I cannot earn it, buy it with money, nor perform for it. I must receive it by Faith; believing that Jesus is the one who paid for my death. He saved me yes; but with the cost of great suffering , and His death.
But there is a price to pay. "He that endures to the end, the same shall be saved." "Many shall fall away." We must view Salvation in this sense to understand this contradiction. We are being saved, we are being conformed, IF we continue steadfast under His Lordship and discipline.
Hebrews makes it very, very clear that if we do not, we are bastards, and not sons. We can fall away; there is a great apostasy occuring, even now.
Also the Parable about the COST, the Pearl of great Price. The cost; EVERYTHING. "For God so love the World..." He gave, or, He paid the life and torture of His only Son, to gain us. God crucified God. That's a high price, certainly not free for Him.
The recipient too, must obey, and endure, out of love for the goodness of God. This involves sorrow, and suffering, and a dying to myself, giving all that I am, as He did, for Him....renouncing all that he has....all the future, all the loves and desires of this life, to gain His life.
This is at the very heart of the Gospel. Jesus endured the pain and rejection of His Cross, and in our lives, we must too, in order to become like Him; to love as He does. It is a gift, but there is a cost; a big one.