HYMN DAY! This is more contemporary, but I love the words to “He Who Began a Good Work in You” by Jonathan Mark Mohr (and sung by Steve Green—you can listen to it here: https://www.youtube.com/watch?v=ZsynL7m_1VE. The chorus has spoken assurance to me many times in my life.
He who began a good work in you
He who began a good work in you
Will be faithful to complete it
He’ll be faithful to complete it
He who started the work
Will be faithful to complete it in you
If the struggle you’re facing
Is slowly replacing
Your hope with despair
Or the process is long
And you’re losing your song
In the night
You can be sure
That the Lord has His hand on you
Safe and secure
He will never abandon you
You are His treasure
And He finds His pleasure in you
He who began a good work in you
He who began a good work in you
Will be faithful to complete it
He’ll be faithful to complete it
He who started the work
Will be faithful to complete it in you