I am fine to go with as quality of life depending on context.
[
166 (
aiṓnios) does not focus on the future
per se, but rather on the
quality of the
age (
165 /aiṓn) it relates to. Thus believers live in "
eternal (
166 /aiṓnios) life" right
now, experiencing this
quality of God's life now as a
present possession. (Note the Gk
present tense of
having eternal life in Jn 3:36, 5:24, 6:47; cf. Ro 6:23.)]
I think for eschatological reasons "aionos" is best understood as time periods.
I think that there are plenty of verses that affirm the security of the believer, as you know I am very firm on, however one has to admit that when we receive eternal life our quality of life is indeed better.
This also goes with what Jesus stated.
“I came to give life more abundantly”
John 10:10