Is that from the KJV? The RSV says something different.
4 For it is impossible to restore again to repentance those who have once been enlightened, who have tasted the heavenly gift, and have become partakers of the Holy Spirit,
5 and have tasted the goodness of the word of God and the powers of the age to come,
6 if they then commit apostasy, since they crucify the Son of God on their own account and hold him up to contempt.
This says that those who commit apostasy crucify him again and hold him in contempt. Not that they would need to crucify Him again to gain forgiveness.
The point here is that once you are filled with the Spirit and taste the goodness, apostasy is really, really bad.
SD
Yes, it is from the KJV.
You make an interesting point with your reading from the RSV. I guess it depends on what the word "seeing" in the KJV means.
-ksen