I would beg to differ.
From fear, or from what, then?
With all due respect to your Greek teacher, nonsense. Any Greek grammar text explains it clearly. There's nothing to be afraid of.
The problem is your dismissal of it from very bad advise, from one who should know better.
Listen to me FG,
I really don't wish to argue this with you.
You have an attitude that is difficult to contend with.
You shouldn't be demeaning about persons you don't even know.
My friend happens to be a theologian who knows Koine Greek and has taught it.
He knows at least 6 languages that I can think of off hand.
Do you think I'm going to believe what YOU know about Koine Greek over what HE KNOWS?
I asked you about a week ago to post something about koine greek, maybe form the internet or from some book you've studied.
Did you do it ? NO!
Because it's not as simple as you make it out to be.
Anyway, this discussion, if serious, would become very long.
All I'll say is that you cannot take verses out of the N.T. and make doctrine out of them.
The N.T. is an entire thought, a complete thought.
Why is the bible such a great book?
Because it was written over the time span of about 1,500 years and is in complete harmony with itself.
You are attempting to break that harmony.
Please learn about Justification and Sanctification.
If you understand Sanctification you must also understand that there's no such concept as eternal security.
It is eternal only for as long as you have faith, believe and live within the commandments JESUS left us with.
Not the commandments Calvin or Luther left us with.