'Security' in the Bible

For whoever wishes to save his life [in this world] will [eventually] lose it [through death], but whoever loses his life [in this world] for My sake will find it [that is, life with Me for all eternity].

so that you may know the exact truth about the things you have been taught [that is, the history and doctrine of the faith].

saying, “If [only] you had known on this day [of salvation], even you, the things which make for peace [and on which peace depends]! But now they have been hidden from your eyes.

And when they had taken security (bail) from Jason and the others, they let them go.

it is He who has also put His seal on us [that is, He has appropriated us and certified us as His] and has given us the [Holy] Spirit in our hearts as a pledge [like a security deposit to guarantee the fulfillment of His promise of eternal life].