Hebrews 12:15 (CSB) — 15 Make sure that no one falls short of the grace of God and that no root of bitterness springs up, causing trouble and defiling many.
Hebrews 12:7 (CSB) — 7 Endure suffering as discipline: God is dealing with you as sons. For what son is there that a father does not discipline?
Romans 5:3–5 (CSB) — 3 And not only that, but we also rejoice in our afflictions, because we know that affliction produces endurance, 4 endurance produces proven character, and proven character produces hope. 5 This hope will not disappoint us, because God’s love has been poured out in our hearts through the Holy Spirit who was given to us.
James 1:2–4 (CSB) — 2 Consider it a great joy, my brothers and sisters, whenever you experience various trials, 3 because you know that the testing of your faith produces endurance. 4 And let endurance have its full effect, so that you may be mature and complete, lacking nothing.
Biblical Reasons 