Quote from Lucius Annaeus Seneca,
"Why does God afflict the best of men with ill-health, or sorrow, or other troubles? Because in the army the most hazardous services are assigned to the bravest soldiers: a general sends his choicest troops to attack the enemy in a midnight ambuscade, to reconnoitre his line of march, or to drive the hostile garrisons from their strong places. No one of these men says as he begins his march, " The general has dealt hardly with me," but "He has judged well of me.""
Lucius Annaeus Seneca (more quotes by Lucius Annaeus Seneca or books by/about Lucius Annaeus Seneca)
(4 B.C.-A.D. 65) Roman Stoic philosopher, statesman, dramatist, "Seneca the Younger"
Moral Essays, De Providentia (On Providence), 4.8, translated by Aubrey Stewart
God, War, Courage, Sorrow, Honor