'Eternal' in the Bible

based on the hope and divine guarantee of eternal life, [the life] which God, who is ever truthful and without deceit, promised before the ages of time began,

For the [remarkable, undeserved] grace of God that brings salvation has appeared to all men.

so that we would be justified [made free of the guilt of sin] by His [compassionate, undeserved] grace, and that we would be [acknowledged as acceptable to Him and] made heirs of eternal life [actually experiencing it] according to our hope (His guarantee).