Because Jesus Loves You: He has given you his eternal sinless life.
Eternal - Cognate: 166 aiṓnios (an adjective, derived from 165 /aiṓn ("an age, having a particular character and quality") – properly, "age-like" ("like-an-age"), i.e. an "age-characteristic" (the quality describing a particular age); (figuratively) the unique quality (reality) of God's life at work in the believer, i.e. as the Lord manifests His self-existent life (as it is in His sinless abode of heaven). "Eternal (166 /aiṓnios) life operates simultaneously outside of time, inside of time, and beyond time – i.e. what gives time its everlasting meaning for the believer through faith, yet is also time-independent. See 165 (aiōn).
[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.)]