But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you. Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof.

-Bible (NewTestament)
St Matthew 6:33^4

He went like one that hath been stunned, And is of sense forlorn: A sadder and wiser man, He rose the morrow morn.

-Coleridge, Samuel Taylor
  'The Rime of the  Ancient Mariner', pt.7.

Wer nie sein Brot mitTr a« nen aÞ, Wer nie die kummervollen N a« chte, Auf seinem Bette weinen saÞ, Der kennt euch nicht, ihr himmlischen M a« chte. Who never ate his bread in sorrow, Who never spent the darksome hours Weeping and watching for the morrow He knows ye not, ye heavenly powers.

-Goethe,JohannWolfgang von
^6  Wilhelm Meisters Lehrjahre (translated by Carlyle in1824 as Wilhelm Meister's  Apprenticeship).