This is a book of the first and second apologies of Justin Martyr. They are letters he wrote to the people of Rome. It is very interesting to see what he wrote and see what he believed. He lived around the second century after Jesus' death. The first apology is believed to have been written about 150 AD. Below are some quotes from the book which show what Justin Martyr believed on some subjects.
Those found not living as He [Jesus Christ] taught should understand that they are not really Christians. (page 34)
From the above quote you can tell he did not believe in once saved always saved, which states you can live like the world and still go to heaven.
But since consciousness remains for all who have lived,... (page 35)
...after death souls are still conscious...(page 35)
He does not believe in soul sleep.
In the beginning He made the human race with the power of thought and of choosing the truth and of acting rightly, so that all people are without excuse before God. (page 42)
But that by free choice [a person] both walks uprightly and stumbles, we prove as follows.
For God did not make a man and a woman like other things, such as trees and animals, which cannot act by choice; for neither would he be worthy of rewards or praise if he did not choose the good of himself, having been born so; nor, if he were evil, would he be worthy of punishment, not being evil himself, but being unable to be anything other than taht for which he was born.
He did not believe in predestination, but rather in free will as the above quotes show.
And that expression, "The sword will devour you," does not mean that the disobedient will be slain by swords, but the sword of God is fire, of which those who choose to do evil will become the fuel.
He did not believe as many teach today, that all the judgments in the Old Testament just refer to physical death, but rather spiritual death.
If a man, born so close to Jesus' death, believed these things, why do these doctrines hold so many people captive today? Could it be that many people want to believe them and refuse to do the work to discover they are not biblical?