God takes Christians through hardships to refine their purity and likeness in Christ.

Zechariah 13:9

I will bring that group through the fire
and make them pure.
I will refine them like silver
and purify them like gold.
They will call on my name,
and I will answer them.
I will say, ‘These are my people,’
and they will say, ‘The Lord is our God.’”