Reform-Shire: Reform-Shire: Reform-Shire: Make Your Calling and Election Sure
If you mean by supplement: something that completes or makes an addition. I think the Beatitudes is what answers this question. I mentioned only part of it in the sermon I did about the 3 Gs.
I'll post the beatitudes again and add some commentaries to those verses.
You have some very good questions, and that in and of itself is a great relief to find somebody asking tough questions.
I don't think our acceptance is a proof of our election. But, loving one another, desiring to do God's will, and enduring the trials of persecution and the battles against sin. Also, the parable of the soils tell us that when we make it through those battles or trials and remain in the faith, this is an evidence of our election and we will continue to praise God. (Job did).