There is such a great promise of eternal life to the elect, through faith and knowledge of truth,
"to the extent of the hope of eternal life, which God can not lie, promised before times eternal. Now, brought to light in his word at his own timing..." (Titus 1:2)
Before time began God made a promise, established it on his oath, there being nothing greater to establish it on, but accordingly to his purpose by which he can not lie.
"just as he chose us in him before creation of the world to exist holy and blameless in his presence in love predestining us for adoption as his own through Jesus Christ..." (Ephesians 1:4-5).
For those chosen this promise is very precious and honorable and effective. It is a promise that God will always be with us even to the end of the age. It is a promise he is working out all for good to those called according to His purpose.
The promise is fulfilled through "predestinating us for adoption" and adoption is of the Spirit, Romans 8:15-17, and whereby the Spirit seals us as his own thus a guarantor of our inheritance (of the promise of eternal life) until our heavenly Father takes redemption of his own (Ephesians 1:13-14).
Paul writes these are spiritual blessing we have received in Christ, from the riches of His grace and glory, which he lavished on us with all wisdom and insight. Though misunderstood by some, to receive from the riches of God's grace speaks of the abundance of his freely given gifts in Christ.
"In Christ we have obtained an inheritance, having been predestined according to the purpose of his will, the one accomplishing all according to the design of his will" (Ephesians 1:11).
Not matter what we believe about election or predestination or being chosen we were predestined for a purpose, according to his will, in that he gives mercy to whom he wills, and according to his propose which he planned in the beginning before he created the world, though hidden and a mystery until he chose to reveal it in Christ.
"that we the ones hoping in Christ, exist the praise of his glory" (Ephesians 1:12)
See the purpose? God had purpose, a plan for the fullness of time, to the praise of his glory.