Boethius

Videsne igitur quanto in caeno probra volvantur, qua probitas luce resplendeat? In quo perspicuum est numquam bonis praemia, numquam sua sceleribus deesse supplicia.

For in all adversity of fortune, the most unfortunate kind of misfortune is to have been happy.

It is the nature of human affairs to be fraught with anxiety; they never prosper perfectly, and they never remain constant.