Every branch in me that does not bear fruit he takes away, and every branch that does bear fruit he prunes, that it may bear more fruit.
John 15:2 ESV
Many plants must be pruned so that they can grow to their full potential. In order for them to grow and flourish parts have to be cut off. God does the same with us. For those of us who are true branches (truly in the family of God) He sometimes takes us through seasons of pruning and purging so that we can be fully mature.