If this is a “yes”, then, by this passage, not only can a Christian lose his salvation; once it is lost, it can never be recovered.
It's a hearty endorsement of 11th hour redemption then. Why become a Christian when, at any moment, you might f*ck up and lose all? Better to wait, sin like it's going out of style, and then seek redemption at the last minute, so you don't run the risk of effing up and losing it all.