He who began will not quit

"And I am sure that God, who began a good work within you, will continue his work until it is finally finished on that day when Christ Jesus comes back again.
Philippians 1:6 NLT

Let this encourage God's holy people to endure persecution patiently and remain firm to the end, obeying his commands and trusting in Jesus.
Revelation 14:12 NLT"

"God's promise to continue working in our lives requires perseverance on our part.
Whether you are an athlete undergoing grueling physical conditioning, an employee struggling under a mountain of work, or a Christian suffering persecution, the key to perseverance is a clear vision of the goal.
While the goal of an athlete is to win the race and goal of the employee is a job well done, the goal of the believer is nothing less than eternity in the presence of the Lord.
The writer of Revelation encourages Christians to keep their eyes on Jesus, who will reward the faithful, and to obey his Word to the end.
When you feel like giving up, remember the glory that awaits you as a child of God.

from the Touchpoint Bible with commentary by Ron Beers and Gilbert Beers (Tyndale) p 1136