A true believer seeks to obey God. God teaches that we are not to seek sin. Therefore, even though the matter of salvation is closed, the elect will still seek to obey God. Such obedience is an outward sign of the person being a believer.
On a totally unrelated subject, I thought I would share something that touches on the discussions some have had regarding Job and his being "perfect," according to a literal reading of the text.
I came across this in a letter of the Optina Elder, Macarius, and looked it up for myself in the LXX, Job 14:4-5:
"For who shall be pure from uncleanness? not even one; if even his life should be but one day upon the earth..."
Just thought I'd throw that into the mix of what the book of Job says...
I'm not sure that I have any point to make, but found it interesting. I hadn't read that before, since the Hebrew has a different reading.
That's true, a believer seeks God. This obedience is more than an outward sign, however. It is proof that we are persevering, proof that Christ is active within us. Without this, without actively seeking God's will, what sort of faith do we have? James talks about such "faith" in James 2, remember? Even the devil has "faith" - but he certainly does not seek God diligently.
James asks the theoretical question "what would you do if a poor man came into your community, asking for food or clothing"? This is a practical question that defines our faith and love. By our faith working through love, we are persevering in Christ - we are justified. But it doesn't follow that if I do have this positive attitude today, that I will answer James rhetorical question in the positive 10 years from now. I will always ultimately have free will to reject God, although this will be more unlikely as we are further sanctified.
Regards