Wow. Skypair gets it backwards (strike one), JJump misinterprets (strike two), BaptistBeliever says that dispensationalists believe that MOST of the NT doesn't apply to "us" (strike three). No wonder we have this board. It's a place to come to be confused, and share your confusion.
As someone has pointed out to Skypair already, soul=mind, will, emotions, intellect. Spirit is that spirit imparted to each of us at the point of belief.
As to JJump's misinterpretation of these two scriptures:
What does it profit a man to gain the whole world and forfeit (lose) his soul?
He who has found his life will lose it, and he who has lost his life for My sake will find it.
What those two verses actually are saying to us:
What DOES it profit ANYONE to gain the whole world and be lost for eternity? That's the clear, accurate application of this verse. If you put all your eggs in the basket of your own identity, you lose Christ!
He who has found his OWN life, who basks in the glow of his sinful nature, to the exclusion of Jesus Christ, will LOSE his life for eternity. He who SURRENDERS to Jesus Christ LOSES his sinful identity, replacing it with the Righteousness of God in Christ.
Of course OSAS is true! It can't possibly be anything but true! It is NOT a license to sin! On the contrary, it is an invitation to follow in Christ's footsteps. One who is born again REJOICES that the Way, the Truth, and the Life have been made clear!
As a classic dispensationlist I can tell you that we do not believe that MOST of the NT does not apply to Christians. Clearly there are portions addressed to God's Chosen, the Jews, Israel, the Remnant, in preparation for the Kingdom of the Promise. Clearly there are portions that are addressed to Christian Believers, both Jew and non-Jew. While the WHOLE of the NT is an awesome revelation of the majesty of God I, as a Christian, do not meet in a synagogue, or refrain from eating pork, or worship on Saturday, or look for God's Kingdom on earth prior to the rapture of the church, or expect to live on earth during the 1,000 year reign of Christ ... among other things. The classic dispensational viewpoint requires one to spiritually interpret scripture, never relying upon the intellectual machinations of the mind, will, emotions, the natural man, the sinful nature, the flesh. There but for the Grace of God go I.