54 Another incident is not of less importance than those I have mentioned. The wicked were victorious, and the decree for his banishment was signed, to the full satisfaction of those who furthered it. The night had come, the chariot was ready, our haters were exultant, the pious in despair, we surrounded the zealous traveller, to whose honourable disgrace nothing was wanting. What next? It was undone by God. For He Who smote the first-born of Egypt, for its harshness towards Israel, also struck the son of the Emperor with disease.
How great was the speed! There was the sentence of banishment, here the decree of sickness: the hand of the wicked scribe was restrained, and the saint was preserved, and the man of piety presented to us, by the fever which brought to reason the arrogance of the Emperor. What could be more just or more speedy than this? This was the series of events: the Emperor's child was sick and in bodily pain. The father was pained for it, for what can the father do? On all sides he sought for aid in his distress, he summoned the best physicians, he betook himself to intercessions with the greatest fervour, and flung himself upon the ground.
Affliction humbles even emperors, and no wonder, for the like sufferings of David in the case of his child are recorded for us. But as no cure for the evil could anywhere be found, he applied to the faith of Basil, not personally summoning him, in shame for his recent ill treatment, but entrusting the mission to others of his nearest and dearest friends. On his arrival, without the delay or reluctance which any one else might have shown, at once the disease relaxed, and the father cherished better hopes; and had he not blended salt water with the fresh, by trusting to the heterodox at the same time that he summoned Basil, the child would have recovered his health and been preserved for his father's arms.
This indeed was the conviction of those who were present at the time, and shared in the distress.
Source: Orations (New Advent)