 1 Corinthians 3:11 <br><i>
For other Foundation can no man lay than that is laid, which is Jesus Christ .</i>
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Once a person has laid the correct Foundation , Christ Jesus , they should Never re-lay it.
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 Hebrews 6:1-8 <br><i>
1 Therefore leaving the Principles of the Doctrine of Christ , let us go on unto Perfection ; not laying again the Foundation of Repentance from Dead Works , and of Faith toward God , <br>
2 of the Doctrine of Baptisms , and of laying on of hands, and of Resurrection of the Dead , and of Eternal Judgment . 
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3 And this will we do, if God permit. <p>
4 For it is impossible for those who were once Enlightened , and have tasted of the Heavenly Gift , and were made partakers of the HolyGhost , <br>
5 and have tasted the Good Word of God , and the Powers of the world to come, 
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6 if they shall fall away, to renew them again unto Repentance ; seeing they crucify to themselves the Son of God afresh, and put him to an open shame. <br>
7 For the Earth which drinketh in the rain that cometh oft upon it, and bringeth forth herbs meet for them by whom it is dressed, receiveth Blessing from God : 
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8 but that which beareth thorns and briers is rejected, and is nigh unto Cursing ; whose end is to be burned.</i>
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Why is this Scripture delivered so sharply? <br> <br>
Because is Speaks to Blasphemy of the Gospel which is our Eternal Security . Christ died once for all for all Sin for all time.
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A person does not `fall away` by committing Sin . They didn`t get Saved by stopping their Sin but rather by Believing on the Lord Jesus Christ . So, they `fall away` by stopping Believing in Christ Jesus .
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If we continue reading we See that Eternal Security as the Gift for Conversion to Christ .
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 Hebrews 6:9-12 <br><i>
9 But, beloved, we are persuaded better things of you , and things that accompany Salvation , though we thus Speak . <br>
10 For God is not Unrighteous to forget your Work and Labour of Love , which ye have shewed toward his Name , in that ye have ministered to the saints, and do Minister . 
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11 And we Desire that every one of you do shew the same Diligence to the full assurance of Hope unto the end: <br>
12 that ye be not slothful, but followers of them who through Faith and Patience Inherit the Promises .
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Notice the phrase `full assurance of Hope unto the end`. This is the expectation that Christ who started the Work in us will complete it.
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So, to Teach that a person can be Converted multiple times is error .
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If a person `backslides` they remain a Son Just as the Prodigal Son remained a Son even in the pig sty. His Instinct was to Think of Himself as a servant , not worthy to be called a Son , but his Father would have nothing to do with it.
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If a person has ever Received Christ as Savior and Lord they are eternally secure because Sonship is the Gift of God by Christ Jesus . 
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That Gift will never be taken away . We cannot Lose it. We must denounce it to be Lost again. Once that happens a person will never <b>want</b> to be Saved again.
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That is Why Paul said he was persuaded of better things of the hearers. When dealing with a `backslidden` Christian we should remind them of God`s Love and His New Covenant that is not based on Performance but on Relationship . 
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Encourage them to Thank God for His Patient Love and Mercy and Praise Christ for His Perfect Sacrifice . Encourage them to begin exploring their Relationship with Christ through the HolySpirit and the Word .
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 Galatians 6:1 <br><i>
Brethren, if a man be overtaken in a fault , ye which are Spiritual , Restore such an one in the Spirit of Meekness ; considering thyself, lest thou also be tempted.
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So we must Think in terms of restoring rather than rebuilding when dealing with Believers who are overtaken by the cares of this world.
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Try to out- Love your Heavenly Father when dealing with people. You will begin to Understand the meaning of Grace in a much deeper fashion.
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A Sure Foundation Study: http://www.lucasco.info/ProjectManagement/Help.php?iprm=3964&iprm2=0&iprmid=12&exte=1 