When someone talks about spiritual or biblical knowledge and understanding, salvation that is eternal is the most important concept to know and understand. I have read many books, attended many Sunday school lessons, and heard a lot of preachings/teachings that talk about God's love, grace, faith, and salvation.
The problem is that the vast majority of people that go to church every Sunday and most of the ministers in churches seem to not know or understand what salvation is and what it implies. The primary goal of God and the Bible is for man to receive salvation, which is eternal and free, a gift to man by God's love, grace, and faith in His words that cannot lie. Salvation is and should be the most important word in any language because there is no way to see or explain how God saved by grace through faith alone if salvation is not eternal.
My booklet, What is Eternal Salvation? A Big Lie or Simple Truth? was written because of the problems I experienced and to help others have a clearer understanding of what salvation is and how and why it is true. I have dedicated myself as the spiritual paralegal of my family, friends, and community. Like I always say, this could be the best and most important little book you have never read because until you understand salvation, and that it is eternal, the Good News of the Gospel will never make good sense.
For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth;