God washes and scours, trains and nurtures them!
From Grace Gems Daily E-Devotional for February 13, 2017:
(The Preacher's Book)
Frankincense, when it is put into the fire--gives off the greater perfume.
Spice, if it is pounded and beaten--smells the sweeter.
The earth, when it is torn up with the plough--becomes more fruitful.
The seed in the ground, after frost and snow and winter storms--grows the thicker.
The nearer the vine is pruned to the stock--the larger grapes it yields.
The grape, when it is most pressed and beaten--makes the sweetest wine.
Linen, when it is washed and wrung and beaten--is so made fairer and whiter.
In the same way, the children of God receive great benefit by affliction--for by it God washes and scours, trains and nurtures them.
"Every branch that bears fruit He prunes, that it may bear more fruit!" John 15:2