The Doctrines of Grace, which include the Eternal security (better stated as Eternal Surity because Christ is our Surity and not ourselves) are a very humbling set of doctrines. They teach man that he is but dust, that he cannot save, keep nor insure his salvation, neither in time or eternity.
These doctrines are much more humbling than thinking that one could walk away because they teach us that we are to live a godly life because of our calling, yet they teach us that we are unable to do that except we die to ourselves and live to God through Christ.
Whether or not you believe the doctrines of Grace has nothing to do with whether you are a regenerated elect child of God. Belief of the Gospel message brings to light the life and immortality of the Son of God indwelling in you through regeneration. That Spirit works out from you that life that has been created new in the inward man, all the while the outward man will stumble, run, fall, rebel, and make grievous war with that Spirit, but because you are His you cannot be 'lost'. He is unchangeable, he is Eternal, He is spotless, He alone possesses the Righteousness of God and in Him alone is declared that Righteousness that exceeds the righteousness of the Pharisees.
And all this peace and understanding is available to whosoever will call upon him, with our without a ph.d; an understanding of the original languages, usage, grammar, or any other degree or lack of degree of education. Why? Because God speaks the simplest most common language that all who Hear His call know and follow.
May God Bless,
Bro. Dallas