Lucretius, On the Nature of Things 2.1-4
suave, mari magno turbantibus aequora ventis,
e terra magnum alterius spectare laborem;
non quia vexari quemquam’st iucunda voluptas,
sed quibus ipse malis careas quia cernere suave est.
It is a sweet thing, when the winds are troubling the surface of the great sea, to look out from the land at the great trouble of another, not because it is a delightful pleasure that someone is being vexed, but because perceiving those troubles which you are free from is a sweet thing.