We also exult in our sufferings, knowing as we do, that suffering produces fortitude; fortitude, ripeness of character; and ripeness of character, hope; and that this hope never disappoints, because God's love for us floods our hearts through the Holy Spirit who has been given to us.
Romans 5:3-5

Be glad about this, even though it may now be necessary for you to be sad for a while because of the many kinds of trials you suffer. These trials will show that your faith is genuine. It is being tested as fire tests and purifies gold--though your faith is far more precious than mere gold. So when your faith remains strong through many trials, it will bring you much praise and glory and honor on the day when Jesus Christ is revealed to the whole world.
1 Peter 1:6-7


Silver and gold are tested by flames of fire; our thoughts are tested by the LORD.
Proverbs 17:3

For you, God, tested us, to purify us like fine silver.
Psalm 66:10

The sufferings that you are enduring are for your discipline. God is dealing with you as sons; for what son is there whom his father does not discipline?
Hebrews 12:7

And whenever the clay would not take the shape he wanted, he would change his mind and form it into some other shape.
Jeremiah 18:4

For God had something better in mind for us, so that they would not reach perfection without us. Hebrews 11:40