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CovenantInBlood said:
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So what is that which we recieved when a person get born again?

New life by the power of the Spirit of God.

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Do we get a new incorruptible seed, or not?

The "incorruptible seed" is the word of God (I Pet. 1:23). We do not "get" it, but are reborn by it.

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Does everyone remain the same so a sinner doesn't need a brand new spirit?

If the sinner gets a "brand new spirit," what happens to the old one? And why not also a "brand new soul"? You're adding to Scripture. The spirit of the believer is REBORN, not replaced. But that does not make the believer's spirit infallible.

2Co:5:17: Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.
2Co:5:18: And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation;

Ga:4:5: To redeem them that were under the law, that we might receive the adoption of sons.
Ga:4:6: And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father.
Ga:4:7: Wherefore thou art no more a servant, but a son; and if a son, then an heir of God through Christ.

But, if I clearly taught elsewhere that repentance/belief alone was sufficient no one would think coming forward is necessary for salvation,or water baptism is necessary for salvation.