One of the signs that one is saved, which, once again, is required for OSAS, is growth in holiness, in the grace and knowledge of Christ, and in Christlike-ness.
This is what we Christians commonly refer to as "sanctification", as opposed to justification, which is the act of salvation, itself.
In other words, we are saved by justification and, once we are saved, the process of sanctification begins. It is a naturally occuring progression, which is the result of justification, not the cause of it.