Explain what Hebrews means in chapter 6 and 10 about being saved. I have
been taught that once saved always saved is true but according to the Book
of Hebrews this is not true.

I would say that your own personal Bible study has led you to
understand the correct sense of Scripture on this point. The doctrine
known as “once saved, always saved” owes its life to John Calvin, the
early 17th century theologian from Switzerland whose was very influential
in the creation of both the Baptist and the Presbyterian denominations.
Other reformers who are associated with the predestination doctrine (a
broader term under which once saved, always saved can be categorized)
would include John Knox, the founder of Presbyterianism. The doctrine of
once saved, always saved, says, in essence that once a person has truly
been saved by the blood of Jesus Christ, nothing at all can happen to that
person to cause them to lose their salvation. That person could commit
any type or amount of sin, willfully or not which could cause them to
leave God, but their salvation is assured once they are saved by Jesus.

Believers in “once saved, always saved” will point to such
passages as Romans 8:29,30 (“Those he foreknew he also predestined… and
those he predestined, he also called; those he called, he also justified;
those he justified, he also glorified”) and John 10:28,29 (“I give them
eternal life… no one can snatch them out of my hand.”). Both of these
passages, if taken out of their context and if taught without full
consideration of the biblical teaching on salvation, seem to teach that it
is impossible for a saved person to lose their salvation.

Having said that, when one looks at the book of Hebrews, it
seems impossible to conclude that “once saved, always saved” is correct
biblical teaching. For example, consider (and I assume you already have
because of your question) Hebrews 6:4ff. “It is impossible for those who
have once been enlightened, who have tasted the heavenly gift, who have
shared in the Holy Spirit, who have tasted the goodness of the word of God
and the powers of the coming age, if they fall away, to be brought back to
repentance, because to their loss they are crucifying the Son of God all
over again and subjecting him to public disgrace.” Or consider Hebrews
6:11,12 “We want each of you to show this same diligence to the very end,
in order to make your hope sure. We do not want you to become lazy, but
to imitate those who through faith and patience inherit what has been
promised.” Or another is Hebrews 10:26f, “If we deliberately keep on
sinning after we have received the knowledge of the truth, no sacrifice
for sins is left, but only a fearful expectation…. how much more
severely do you think a man deserves to be punished who has trampled the
Son of God under foot, who has treated as an unholy thing the blood of the
covenant that sanctified him, and who has insulted the Spirit of grace”
Dozens of other passages both in Hebrews and other NT books could be cited
to show beyond a doubt that if one turns their back on God, he or she can
lose salvation.

The entire theme of Hebrews is a call for the saved people to
persevere so that they will not lose their salvation. That is what
Hebrews 3:12-4:11 is all about. There is absolutely no question that it
is possible for a person who has been sanctified (to quote Heb 10:29), who
has “shared in the Holy Spirit” (to quote Heb 6:4), to have the Holy
Spirit taken from that person.

The only real question remaining is how to understand such
passages as John 10:28,29. This passage, and others such as Romans
8:37-39 make it clear that no one on the earth can take away our
salvation. In fact, the only one who can cause us to lose our salvation
is us!!! Only my personal decision to deliberately continue in sin, to
insult the Spirit of grace, etc. (to quote Hebrews) can cause God to take
away my salvation. It is necessary to understand Hebrews in light of John
and Romans, and also to understand John and Romans in light of Hebrews.

Similarly with Romans 8:28-30. Taken in context of Hebrews,
one can only conclude that all are predestined (ie God has prepared a
place for all of us), some of the predestined (but not all) are called.
Unfortunately, although God has prepared a home in heaven for all of us,
not all are ever called because the Christians to not get the word out.
An even smaller of those who are called by God to Christ are eventually
justified. Not all who hear of Jesus put their faith in him and are
saved. Even less are glorified. Some who are justified do not keep with
the faith until death, as Hebrews clearly teaches. That is how Hebrews
and Romans 8 make sense together.

A lot more could be said on this, but I hope this helps answer
your question. I really appreciate that you are willing to consider
carefully what you have been taught and to change what you believe if it
is not in conformity with Bible teaching. I encourage you to keep up your
Bible study. Feel free to send me a personal e-mail if you have some more
personal questions on this topic.

John Oakes