Eugene Peterson mentioned there are some roles being sidekick in the whole plan of God, in the instruction page of Exodus in bible “The Message". We are all in the wilderness, on the way to inherit the land He promised. God never use perfect person, but we are all part of His plan.

“Bless our God, O peoples!
Give him a thunderous welcome!
Didn’t he set us on the road to life?
Didn’t he keep us out of the ditch?
He trained us first,
passed us like silver through refining fires,
Brought us into hardscrabble country,
pushed us to our very limit,
Road-tested us inside and out,
took us to hell and back;
Finally he brought us
to this well-watered place." Ps. 66 8-12

“well-watered place" is just the last line.
the main point is :
“passed us like silver through refining fires, brought us into hardscrabble country, pushed us to our very limit"

my Lord, please pass us like silver through refining fires, push us to our very limit.