When you forget to take the sail at all, then the wind is constantly in your favour both ways. But there! this world is only a probation, and man was born to trouble as the sparks fly upward. – Jerome K. Jerome, Three Men in a Boat (To Say Nothing of the Dog), 1889

Men often bear little grievances with less courage than they do large misfortunes. – Aesop

Even as the stone of the fruit must break, that its heart may stand in the sun, so must you know pain…. [A]ccept the seasons of your heart, even as you have always accepted the seasons that pass over your fields…. – Khalil Gibran, The Prophet

Therefore do not be anxious about tomorrow, for tomorrow will be anxious for itself. Let the days own trouble be sufficient for the day. – Bible