Thou hast seen many sorrows, travel-stained pilgrim of the world,
But that which hath vexed thee most, hath been the looking for evil;
And though calamities have crossed thee, and misery been heaped on thy head,
Yet ills that never happened, have chiefly made thee wretched.

Martin Farquhar Tupper (1810–1889) English poet

Proverbial Philosophy, “Of Anticipation” (1839)
    (Source)