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This author attempts to explain the fifth petal of the Calvinistic TULIP:
(T) otal Depravity(U) nconditional Election(L) imited Atonement(I) rresistible Grace(P) erseverance of the Saints
The perseverance of the saints (eternal security) is based upon the assumptions of these five interrelated doctrines. The author believes a Christian cannot lose his salvation, and this is because of the unstated belief that God chooses those who will be saved (the U in TULIP).
The author makes a big noise for his doctrine, but it's really an exercise in futility. First because there is no such thing as being absolutely certain of one's salvation, and second because the doctrine makes no difference in any privilege or obligation of our faith.
And the author never deals with the other side of the issue, a Christian deciding to forfeit his salvation. This is not losing one's salvation, this would be rejecting it.
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